N.E.A.M.A

* AG7 6-Way Power Seat
* AK1 Custom Deluxe Seat Belts
* AL5 Deluxe Rear Center Seat Belt, '67
* AN7 Strato-Bucket Seats, swing out
* Al3 Power Door Locks
* Al6 Power Tailgate Release
* AO1 Soft Ray Tinted Glass, all windows
* AO2 Tinted Glass, windshield only
* AQ2 Electric Seat Back Lock Release, '71
* AQ5 Electric Seat Back Lock Release, '70
* AS1 Shoulder Harness, '67+
* AS4 Deluxe Rear Seat Shoulder Harness, '68+
* AS5 Standar Rear Seat Shoulder Harness, '68+
* AT8 Reclining Passenger Seat
* AU1 Electric Door Locks, '70+
* AU3 Power Door Locks
* AV3 3 Point Seat Belts (from 1972 build sheet)
* A20 Custom Seat Belts, '64
* A20 Swing Out Rear Windows, Laguna
* A31 Power Windows
* A33 Power Tailgate Window
* A39 Custom Deluxe Front and Rear Seat Belts, '66+
* A37 Seat Belt Equipment, '64 only
* A41 Power Front Seat, 4-way
* A42 Power Seat, 6-way
* A41 Power Bucket Seat, 4-way
* A46 Power Drivers Bucket Seat, '66+
* A47 Custom Deluxe Seat Belts
* A49 Custom Deluxe Seat Belts, w/retractors
* A51 Front Bucket Seats, Astro
* A52 Front Bench Seat
* A62 Seat Belt Delete
* A64 Custom Deluxe Rear Seat Belts, '65
* A65 Split Front Seat with Arm Rest
* A66 Split Second Seat
* A68 Standard Rear Center Seat Belt, '67
* A81 Head Rest, Bucket Seats
* A82 Head Rest, Bench Seat
* A85 Deluxe Shoulder Harness, '66 1/2+
* A90 Electric Trunk Opener
* A93 Vacuum Door Locks, '69


* BO1 Police Body Equipment, '64-'65
* BO2 Taxi, '64-'65
* BW2 Deluxe Body Side Molding
* BX4 Body Side Molding
* BX8 Full Body Moldings
* BW1 Delete Tailgate Ornamentation
* B2H Interim Equipment Change
* B2M No Power Steering
* B22 Door Trim Pad Emblem "SS"
* B37 Colored Floor Mats
* B44 Removable Load Floor Carpet
* B55 Deluxe Front Seat Cushion, '67+
* B70 Padded Dash '64-'65
* B75 Lining Lug Compartment, '69
* B80 Roof Drip Molding
* B81 Delete Tailgate Molding, this would delete the horizontal trim strips on the tailgate of a '70-'72 El Camino or GMC Sprint
* B84 Body Side Molding
* B85 Beltline Reveal Molding
* B90 Door Window Frame Moldings
* B93 Door Edge Guards
* B94 "GMC" Tailgate Emblem, '71-'72 GMC Sprint only
* B95 Rear End Panel Molding, '69
* B96 Wheel Well Moldings


* CA1 Power Roof
* CB1 Vinyl Roof, Touring
* CB7 Vinyl Roof Cover
* CD2 Windshield Washer Level Control, '70+
* CD3 Electro-tip Wipers, '70+
* CE1 Headlight Washers
* CO5 Convertible Top, Manual
* CO6 Convertible Top, Power
* CO8 Vinyl Roof, full
* CO9 Padded Vinyl Roof
* C14 Two Speed Wipers, '64
* C24 Special Windshield Wipers
* C48 Heater Delete
* C49 Electro Clear Defogger
* C50 Rear Window Defogger
* C51 Rear Window Air Deflector
* C56 I/P Side Vent /70 Upper Level Vent / Astro Ventilation
* C60 Air Conditioning, 4 seasons
* C65 Air Conditioning, deluxe version


* D24 Litter Container
* D33 Remote Control Mirror
* D34 Vanity Visor Mirror
* D35 Sports Mirrors
* D55 Console
* D64 Illuminated Visor Mirror
* D68 Twin Remote Sport Mirrors
* D80 Spoilers
* D88 Sport Stripe, '70+
* D91 Conquista Package
* D96 Wide Paint Stripes, '67+ refers to body side accent stripe
* D99 Two Tone Paint Moldings


* FE8 Radial Tuned Suspension
* F40 Sport Suspension
* F41 Sport Front and Rear Suspension, '69+


* GS1 2.73 Ratio Axle (from 1972 build sheet)
* GY2 3.31 Ratio Axle, '71-'72 Chevelle / El Camino / GMC Sprint
* G11 2.56 Rear Axle
* G66 Air Shocks, rear
* G67 Controller for Air Shocks
* G75 3.70 Rear Axle
* G76 3.36 Rear Axle
* G80 Positraction Rear
* G82 4.56 Rear Axle
* G84 4.10 Rear Axle
* G92 Performance Rear 3.08
* G94 3.31 Rear Axle
* G95 Economy Rear 2.73
* G96 3.55 Rear
* G97 2.73 Rear Axle
* GW5 273 Rear Axle


* HO1 3.07 Rear Axle
* HO5 3.73 Rear Axle


* J50 Power brakes
* J52 Front Disc Brakes, '67+
* J65 Metallic Brake Linings
* JL2 Front Disc Brakes, '70+
* JL8 4-Wheel Disc Brakes, '69 only

* KD5 Heavy Duty PCV System
* KO2 Clutch Fan
* KO5 Engine Block Heater
* K19 Air, Smog Pump, '66+
* K24 Closed Engine Ventilation, PCV
* K30 Cruise Control
* K66 Transistor Ignition
* K72 Emission Control Delete
* K75 Emission Control Delete
* K76 61 Amp Alternator
* K77 55 Amp Alternator
* K79 42 Amp Alternator
* K81 62 Amp Alternator
* K85 63 Amp Alternator


* L14 Refers to: 307 CID STD V8 (from '72 Chevelle)
* L22 6-Cylinder 250
* L26 230-140 Hp
* L30 327-275 Hp
* L34 396-350 Hp
* L35 396-325 Hp
* L48 350-300 Hp, '69+
* L61 230 cid
* L65 350-250 Hp, '69+
* L72 427-425 Hp Yenko, '69
* L73 327-250 Hp, '68
* L74 327 300 Hp
* L77 4 Barrel Carb, 283-220 Hp
* L78 396-375 Hp
* L79 327-350 Hp
* L89 396-375 Hp Aluminum Heads
* LB4 262 (4.3 liter) TBI v6, 145 fwhp
* LF6 400-255 Hp, 2 bbl, '70 (Monte Carlo)
* LM1 350-255 Hp, '69
* L03 305 (5.0 liter) TBI v8, 170 fwhp
* L05 350 (5.7) TBI v8, 190-210 fwhp 1988-1996
* LS3 400-330 Hp, '70+
* LS4 454-235 Hp
* LS3 402-300 Hp in '71, 240 Hp in '72
* LS5 454-365 Hp in '71, 270 Hp in '72 - LS5 (also 360 HP in '70).
* LS6 454-450 Hp, '70
* LT-1 350- up to 350 (gross) fwhp early 1970s
* LT1 350-260 fwhp B/D cars '94-'96; 275-285 fwhp Fcars '93-'97; 300 fwhp Ycar 1992-1996
* LT-4 400-180 Hp early/mid 1970s 400 sbc
* LT4 350-340 fwhp optional on '96 Ycar, and limited '97 Fcar. Larger intake runner head, manifold
* L65 350-145 2 Barrel
* L-82 350 190 fwhp, last of carburated Ycar engines
* L-83 350 200-205 fwhp, '82 & '84 Ycar, Crossfire injection (dual TBI fed enclosed tuned port runner)
* L90 6-Cylinder
* L98 350 (5.7 liter) v8, 230-250 fwhp 1985-1992, TPI (tuned port injection) intake manifold


* MO1 Heavy Duty Clutch
* MC1 Heavy Duty 3-speed Transmission
* M10 Overdrive
* M11 Floor Shift Transmission, '71+
* M13 Heavy Duty Transmission
* M20 4-Speed Standard Transmission
* M21 4-Speed Close Ratio
* M22 4-Speed Heavy Duty
* M35 Powerglide Automatic 2-Speed
* M38 Turbo 350 Automatic
* M40 Turbo 400 Automatic
* M55 Transmission Cooler


* NA9 Evaporative Emission Controls
* NB2 Refers to: EXH EMISSION (from '72)
* NC8 Chambered Exhaust System
* NK1 Cushioned Steering Wheel
* NK2 Custom Steering Wheel, '71+
* NK4 Sport Steering Wheel, '71+
* N10 Dual Exhaust
* N30 Deluxe Steering Wheel, '67+
* N31 Custom Steering Wheel
* N33 Tilt Steering
* N34 Wood-Grained Steering Wheel
* N40 Power Steering
* N41 Power Steering
* N65 Space-Saving Spare
* N95 Wire Wheel Covers
* N96 Simulated Mag Hubcaps
* N97 15" diameter heavy duty police package wheels


* P19 Spare Tire Lock
* P58 7.14.4 Whitewalls
* P61 7.75-14 W/W
* P62 7.75-14.4 W/W
* P67 6.95-14 W/W
* P77 8.25-14 W/W
* P90 G70-15 White Stripe
* P91 G70-15 Red Stripe
* PA2 Simulated Wire Wheels, 2nd style, '68+
* PA3 Deluxe Wheel Covers
* PE1 Turbine 1 Wheels
* PE2 Turbine 2 Wheels
* PK2 G78-14 W/W
* PK4 G70-14 Red Stripe
* PL3 E78-14 White Stripe
* PL4 F70-14 F70-14 White Stripe
* PL5 F70-14 White Letters
* PM6 G78-14 White Stripe
* PM7 F60-15 White Letters, SS models and Sprint SP models
* PN5 7.75-14 8-Ply Tires
* PO1 Wheel Trim Cover
* PO2 Simulated Wire Wheels, 14"
* PO3 stainless wheel covers
* PO6 Wheel Trim Rings
* PQ7 8.25-14 W/W Tires
* PR3 8.25-14 8-Ply W/W
* PU8 G78-15 White Stripe
* PL2 E78X14 B/WALL
* PW7 F70-14 White Stripe
* PW8 F70-14 Red Stripe Tires
* PX5 F78X14 Black Wall Belted (70)
* PX6 F78-14 W/W
* PX8 G70-14 W/W
* PX9 G70-14 Dual White Stripes
* PY4 F70-14 W/W
* PY5 F70-14 Red Stripe
* PY7 G70-14 Red Stripe
* QDR GR78-15 Radial Whitewalls
* QEH E78-14 Bias White Stripe
* QEL HR78-15 Radial White Stripe
* QGF G70-14 Bias White Stripe
* QGL G78-14 Bias White Stripe
* QHE H78-14 Bias
* QHF H78-14 Bias White Stripe
* QQZ HR70-15 Radial Whitewall
* QRM GR70-15 Radial Whitewall
* QRN GR70-15 Radials
* QRV HR70-15 Radials
* QRZ GR70-15 Radial White Letter
* TO7 7.75-14 W/W Tires
* T15 7.75-15 8-Ply Tires
* T58 Rear Wheel Skirts, Monte Carlo
* T60 Heavy Duty Battery


* UA1 Heavy Duty Battery
* UM1 AM Radio with Tape, '70+
* UM2 AM/FM with Tape
* UO3 Low Note Horn, D
* UO5 Dual Horns
* UF1 Mirror Lamp, available in '70-'72
* UF7 Econominder Gauge Package
* U11 Certified Speedometer instrument cluster, police and special service package
* U14 Instrumentation Package
* U15 Speed Warning Indicator, '67+
* U16 Tachometer
* U17 Cluster Instruments, (oil coolant, ammeter, clock, fuel, tachometer)
* U18 Export Speedometer
* U25 Trunk Light
* U26 Underhood Light
* U27 Glove box Light
* U28 Ash Tray Light
* U29 Instrument Panel Courtesy Lighting
* U35 Clock
* U46 Lamp Monitoring Equipment
* U57 8 Track Tape Player
* U58 AM/FM
* U60 Manual Radio
* U63 Basic Old AM Radio
* U69 AM/FM Radio with Buttons
* U73 Manual Rear Antenna
* U75 Power Rear Antenna
* U76 Antenna in Windshield
* U79 Stereo Equipment
* U80 Rear Speaker


* VE5 Deluxe Bumper Strips
* VO1 Heavy Duty Radiator
* VO2 Heavy Duty Radiator, '64
* V30 Bumper Guards, full set (front only bumper guards on El Camino / GMC Sprint)
* V31 Front Bumper Guards, '64-'70
* V32 Rear Bumper Guards, '64-'70
* V55 Roof Rack
* V74 Hazard Warning Equipment, '66
* V75 Traction Dispenser Set-Up

* WX3 merchandised trim package, '94-'96 Impala SS
* W84 Additional Fuel for Delivery


* X11 Style Trim for Base Car or SS
* X22 Style Trim for SS with 396
* X33 Style Trim for Z/28 or RS with Z/28 Option
* X44 Base Car
* X55 Base SS with 350
* X66 Base SS with 396
* X77 '69 Z-28 Camaro, (Norwood, Ohio cars only)


* YD1 Trailoring Axle
* YE7 Special Performance "SP" Package, '71-'72 GMC Sprint
* YF3 The Heavy Chevy Package
* YF5 Emission Tested
* YJ9 Exterior Dress-Up Package


* Z10 Special Hardtop Pace Car
* Z11 Indy Pace Car Accents , '69 only
* Z21 Style Trim Group
* Z22 Rally Sport
* Z23 Special Interior Package
* Z27 SS Equipment
* Z28 Special Performance Package
* Z87 Custom Interior Group
* ZO1 Comfort and Convenience Group, '64-'65
* ZO2 Pushbutton Radio and Extra Speaker, '64
* ZO4 Heavy Duty Chassis, '64-'65.
* ZO8 Body Molding/Trim
* ZJ7 Rally Wheels
* ZJ9 Auxiliary Lighting Group
* ZJ6 Special Sport Sedan, '68+
* ZJ7 Steering Wheel Deluxe Trim
* ZJ9 Auxiliary Lighting Group
* ZK3 Deluxe Seat Belts, and Front Shoulder Harness, '68+
* ZK5 Concours Sedan, '68
* ZK6, 7 Concours Sport Coupe, '68
* ZK8 Refers to Tire Pressure Label, '70
* ZKQ Tire Pressure Sticker
* ZL2 Special Hood, Cowl Induction, '70+
* ZL3 SS 396 Convertible
* ZO9 Performance Rear Axle, '70+
* Z10 Pace Car Coupe
* Z11 Indy Pace Car Convertible
* ZP2 Trim and Color Override (for cars that had an exterior/interior color or trim combination that was not normally available)
* ZR3 Off Road Package 454 (LS7 & LT2), '69
* Z02 Spec Paint (from 72 tag)
* ZP5 Appearance Guard Group
* ZW4 Standard 3-Speed Transmission, '70
* Z13 Comfort and Convenience Group, second style, '64-'65.
* Z14 A/C BODY CONV (info from 72 Chevelle)
* Z15 SS Equipment, (454 in '70)
* Z16 Special Sport Coupe, '65 Chevelle
* Z19 Convenience Group, '66
* Z20 Monte Carlo SS 454
* Z25 Super Sport Option, '69+
* Z29 Vinyl Stripe
* Z49 Canadian Base Equipment
* Z57 Vinyl Coated Trim
* Z83 Road Hazard Package, '66
* Z95 Regular Fuel Engine Equipment


SEO (Special Equipment Option) codes -- number/letter/number

* 1A2 special service vehicle (wagon police package, reduced content)
* 1T1 (green) silicone rubber (engine) hoses
* 6J6 aux brake/turn lamps, rear package shelf
* 7X6 spotlamp, police, driver's side A pillar
* 7X7 spotlamp, police, driver and passenger side A pillars
* 9C1 police package (70s Chevelle, 1977-2007 Caprice/Impala)
* 9C3 special service vehicle (fwd police package, reduced content)
* 9C6 taxi

http://crankshaftcoalition.com/wiki/More_GM_RPO_codes

This has every single GM build code, to much to put here