Here are the RPO codes thanks to @1ton-o-fun
RPO Description Matches
UF2 LAMP,CARGO CARGO LP(UF2) 22,317
UX1 RADIO,AM/FM STEREO,WEATHER,CASSETTE,EQUALIZER,ETR,INCLUDES CLOCK STEREO AM/FM W/CASS & EQLZR(UX1) 31,008
U16 TACHOMETER,ENGINE TACH(U16) 54,204
U66 SPEAKER SYSTEM,4,DUAL FRONT DASH MOUNTED,DUAL EXTENDED RANGE PACKAGE SHELF/QUARTER 4 SPKR SYS(U66) 96,909
VB3 BUMPER,REAR STEP,INCLUDES IMPACT STRIP(CHROME) CHROME STEP BPR(VB3) 44,355
VG3 STRIP,FRONT BUMPER IMPACT FRT BPR IMP STR(VG3) 58,320
VK3 LICENSE PLATE,FRONT MOUNTING PACKAGE FRT LIC PLT MTG PKG(VK3) 87,414
VXT LABEL INCOMPLETE VEHICLE INCOMPLETE VEH LABEL(VXT) 10,502
V22 GRILLE,RADIATOR(CHROME) CHROME GRL(V22) 90,107
V73 VEHICLE STATEMENT - US/CANADA US/CANADA VEHICLE STATEMENT(V73) 97,042
XFN Unknown 46,129
YD3 AXLE FRONT (BASE EQUIP) FOR SCHEDULING GVW PLATE FRT AXLE(YD3) 97,580
YD6 SPRING,REAR(BASE EQUIPMENT) RR SPRING(YD6) 97,580
YE9 CONVENIENCE PKG COMFORT & DECOR LEVEL #3 COMFORT & CONVENIENCE PKG #3(YE9) 60,534
YFN TIRE REAR - P235/75R15-105S RWL R/PE ST TL ALS 46,129
YK6 IDENTIFICATION - (SEO) 14,243
ZFN TIRE SPARE SPARE TIRE(ZFN) 46,129
ZQ2 DRIVER CONVENIENCE PACKAGE DRVR CONVENIENCE PKG(ZQ2) 63,386
ZQ3 DRIVER CONVENIENCE PACKAGE II(MERCHANDISING OPTION) DRVR CONVENIENCE PKG(ZQ3) 76,156
Z88 GMC TRUCK G M C(Z88) 22,462
01U EXTERIOR COLOR,PRIMARY,SPECIAL OVERRIDE (01U) 5,391
1SD PACKAGE-OPTION 04 (1SD) 52,887
1SZ PACKAGE OPTION- (1SZ) 97,558
13I INTERIOR TRIM,LT SMOKE GRAY (13I) 47,860
13W TRIM COMBINATION VINYL,LT SMOKE GRAY (13W) 365
5Q4 PROVISIONS - FRT BENCH SEATING (SEO) 7,528
6WN COMPONENT FRT LH COMPUTER SEL SUP (6WN) SUSP(6WN) 58,821
7WN COMPONENT FRT RH COMPUTER SEL SUP (7WN) SUSP(7WN) 58,821
8E2 FRONT SEAT DELETE 8E2) 10,502
8F0 ORNAMENTATION,EXTERIOR,DELETE,UPLEVEL 8F0) 4,055
AU3 LOCK,SIDE DOOR,ELECTRIC(EXPORT,CANADA) ELEC S/D LK(AU3)(EXPORT,CANADA) 63,386
A31 WINDOW,ELECTRIC OPERATED,SIDE ELEC SI WDO(A31) 63,386
B3P SALES PROCESSING OPT - BAILMENT COMMERCIAL 2,671
B32 COVERING,FLOOR MATS,FRONT AUXILIARY FRT AUX FLR MATS(B32) 60,242
C5G GVW RATING(5600 LBS) 5600 LB GVWR(C5G) 97,578
C60 AIR CONDITIONER,FRONT,MANUAL CONTROLS A/C MAN CONT(C60) 96,653
C95 LAMP,INTERIOR,ROOF COURTESY AND DUAL READING DM & READING LP(C95) 64,465
D45 MIRROR,OUTSIDE,BELOW EYELINE(STAINLESS STEEL)(9.5 X 6) O/S STAINLESS STEEL MIR(D45) 62,462
E63 BODY EQUIPMENT,FLEETSIDE PICKUP BOX FLEETSIDE PUBX(E63) 61,672
FWI PLANT CODE FORT WAYNE, IN GM T&B FORT WAYNE,IN PLANT(FWI) 97,580
GU6 AXLE,REAR,3.42 RATIO 3.42R(GU6) 54,838
JB5 BRAKE SYSTEM,VACUUM POWER DISC,DRUM VACUUM PWR BRK SYS(JB5) 97,580
K34 CRUISE CONTROL,AUTOMATIC,ELECTRONIC CRCONT(K34) 76,156
K60 GENERATOR,100 AMPERE 100 AMP(K60) 97,051
L05 ENGINE,5.7L(5.7-7)GAS 8 CYLINDER 5.7-7(L05) 37,989
MX0 TRANSMISSION,AUTOMATIC,OVERDRIVE(MERCHANDISING OPTION) A/TRANS PROVISIONS(MX0) 82,261
M30 TRANSMISSION,AUTOMATIC 4 SPEED,4L60E,ELECTRONIC 4-SPD A/TRANS(M30) 81,419
NA1 EMISSION SYSTEM,LESS THAN 8500 LB GVW EMIS SYS(UNDER 8500 LB GVW)(NA1) 89,085
NA6 EMISSION SYSTEM,ALTITUDE REQUIREMENTS ALT EMIS(NA6) 12,771
NK3 STEERING WHEEL,SPORT,SOFT RIM,SIMULATED LEATHER SIMULATED LEATHER STRG WHL(NK3) 60,534
N33 STEERING COLUMN,TILT TYPE TILT STRG COL(N33) 76,156
P06 RING,WHEEL TRIM WHL TR RING(P06) 40,950
P2A PRICING ONE COLOR, CLASS A (B/F/J/W-TRK CKGMST) CLASS "A" ONE COLOR PRICING(P2A) 423
R6W CONTROL - SALES ITEM NO. 22 2,127
SLM SALES PROCESSING - STOCK ORDERS 88,137
TFE SALES INCENTIVE - COMMITMENT PLUS 20,590
TGK SPECIAL PAINT SOLID, USED FOR ORDERING PURPOSES. SPECIAL PAINT(TGK) 5,324
TR9 LAMP GROUP,COURTESY LP GRP(TR9)
RPO Description Matches
UF2 LAMP,CARGO CARGO LP(UF2) 22,317
UX1 RADIO,AM/FM STEREO,WEATHER,CASSETTE,EQUALIZER,ETR,INCLUDES CLOCK STEREO AM/FM W/CASS & EQLZR(UX1) 31,008
U16 TACHOMETER,ENGINE TACH(U16) 54,204
U66 SPEAKER SYSTEM,4,DUAL FRONT DASH MOUNTED,DUAL EXTENDED RANGE PACKAGE SHELF/QUARTER 4 SPKR SYS(U66) 96,909
VB3 BUMPER,REAR STEP,INCLUDES IMPACT STRIP(CHROME) CHROME STEP BPR(VB3) 44,355
VG3 STRIP,FRONT BUMPER IMPACT FRT BPR IMP STR(VG3) 58,320
VK3 LICENSE PLATE,FRONT MOUNTING PACKAGE FRT LIC PLT MTG PKG(VK3) 87,414
VXT LABEL INCOMPLETE VEHICLE INCOMPLETE VEH LABEL(VXT) 10,502
V22 GRILLE,RADIATOR(CHROME) CHROME GRL(V22) 90,107
V73 VEHICLE STATEMENT - US/CANADA US/CANADA VEHICLE STATEMENT(V73) 97,042
XFN Unknown 46,129
YD3 AXLE FRONT (BASE EQUIP) FOR SCHEDULING GVW PLATE FRT AXLE(YD3) 97,580
YD6 SPRING,REAR(BASE EQUIPMENT) RR SPRING(YD6) 97,580
YE9 CONVENIENCE PKG COMFORT & DECOR LEVEL #3 COMFORT & CONVENIENCE PKG #3(YE9) 60,534
YFN TIRE REAR - P235/75R15-105S RWL R/PE ST TL ALS 46,129
YK6 IDENTIFICATION - (SEO) 14,243
ZFN TIRE SPARE SPARE TIRE(ZFN) 46,129
ZQ2 DRIVER CONVENIENCE PACKAGE DRVR CONVENIENCE PKG(ZQ2) 63,386
ZQ3 DRIVER CONVENIENCE PACKAGE II(MERCHANDISING OPTION) DRVR CONVENIENCE PKG(ZQ3) 76,156
Z88 GMC TRUCK G M C(Z88) 22,462
01U EXTERIOR COLOR,PRIMARY,SPECIAL OVERRIDE (01U) 5,391
1SD PACKAGE-OPTION 04 (1SD) 52,887
1SZ PACKAGE OPTION- (1SZ) 97,558
13I INTERIOR TRIM,LT SMOKE GRAY (13I) 47,860
13W TRIM COMBINATION VINYL,LT SMOKE GRAY (13W) 365
5Q4 PROVISIONS - FRT BENCH SEATING (SEO) 7,528
6WN COMPONENT FRT LH COMPUTER SEL SUP (6WN) SUSP(6WN) 58,821
7WN COMPONENT FRT RH COMPUTER SEL SUP (7WN) SUSP(7WN) 58,821
8E2 FRONT SEAT DELETE 8E2) 10,502
8F0 ORNAMENTATION,EXTERIOR,DELETE,UPLEVEL 8F0) 4,055
AU3 LOCK,SIDE DOOR,ELECTRIC(EXPORT,CANADA) ELEC S/D LK(AU3)(EXPORT,CANADA) 63,386
A31 WINDOW,ELECTRIC OPERATED,SIDE ELEC SI WDO(A31) 63,386
B3P SALES PROCESSING OPT - BAILMENT COMMERCIAL 2,671
B32 COVERING,FLOOR MATS,FRONT AUXILIARY FRT AUX FLR MATS(B32) 60,242
C5G GVW RATING(5600 LBS) 5600 LB GVWR(C5G) 97,578
C60 AIR CONDITIONER,FRONT,MANUAL CONTROLS A/C MAN CONT(C60) 96,653
C95 LAMP,INTERIOR,ROOF COURTESY AND DUAL READING DM & READING LP(C95) 64,465
D45 MIRROR,OUTSIDE,BELOW EYELINE(STAINLESS STEEL)(9.5 X 6) O/S STAINLESS STEEL MIR(D45) 62,462
E63 BODY EQUIPMENT,FLEETSIDE PICKUP BOX FLEETSIDE PUBX(E63) 61,672
FWI PLANT CODE FORT WAYNE, IN GM T&B FORT WAYNE,IN PLANT(FWI) 97,580
GU6 AXLE,REAR,3.42 RATIO 3.42R(GU6) 54,838
JB5 BRAKE SYSTEM,VACUUM POWER DISC,DRUM VACUUM PWR BRK SYS(JB5) 97,580
K34 CRUISE CONTROL,AUTOMATIC,ELECTRONIC CRCONT(K34) 76,156
K60 GENERATOR,100 AMPERE 100 AMP(K60) 97,051
L05 ENGINE,5.7L(5.7-7)GAS 8 CYLINDER 5.7-7(L05) 37,989
MX0 TRANSMISSION,AUTOMATIC,OVERDRIVE(MERCHANDISING OPTION) A/TRANS PROVISIONS(MX0) 82,261
M30 TRANSMISSION,AUTOMATIC 4 SPEED,4L60E,ELECTRONIC 4-SPD A/TRANS(M30) 81,419
NA1 EMISSION SYSTEM,LESS THAN 8500 LB GVW EMIS SYS(UNDER 8500 LB GVW)(NA1) 89,085
NA6 EMISSION SYSTEM,ALTITUDE REQUIREMENTS ALT EMIS(NA6) 12,771
NK3 STEERING WHEEL,SPORT,SOFT RIM,SIMULATED LEATHER SIMULATED LEATHER STRG WHL(NK3) 60,534
N33 STEERING COLUMN,TILT TYPE TILT STRG COL(N33) 76,156
P06 RING,WHEEL TRIM WHL TR RING(P06) 40,950
P2A PRICING ONE COLOR, CLASS A (B/F/J/W-TRK CKGMST) CLASS "A" ONE COLOR PRICING(P2A) 423
R6W CONTROL - SALES ITEM NO. 22 2,127
SLM SALES PROCESSING - STOCK ORDERS 88,137
TFE SALES INCENTIVE - COMMITMENT PLUS 20,590
TGK SPECIAL PAINT SOLID, USED FOR ORDERING PURPOSES. SPECIAL PAINT(TGK) 5,324
TR9 LAMP GROUP,COURTESY LP GRP(TR9)