RPO code help

[Stitch]

I have some rpo's of the crew cab that I just acquired that I can't figure out...I'm going to list all of them and if anyone knows any, I'll match them to what I have come up with...I don't know if I have all these right or not...this is from research on about 30 different stupid sites...lol...can yall look it over and see what I have wrong and fill in the blanks...thanks fellas


AS3 - SEAT ASM,RR don't know what ASM stands for
A52 - SEAT ASM,FRT BENCH
B7P - BODY EQUIPMENT,PICKUP BOX PANELS(PRIME) Prime?
C6P - 8600 LB GVW
C91 - LAMP,DOME
D1V - GEAR, SPEEDO DRIVEN
D45 - MIRROR,O/S BELOW EYELINE(STNLS STL)
E2E -
E6D - COUNTRY GAZA wierd, but it's what came up in a search
E63 - BODY EQUIPMENT,FLEETSIDE PICKUP BOX
E8A - COVER, RR COMPT TONNEAU, RR COMPT - DELETE another wierd one, but it also came up in a search
GQ1 - REAR AXLE - STANDARD is this a 14 bolt
GT5 - AXLE,RR 4.10 RATIO
JB7 - BRAKE SYSTEM,VAC PWR DISC/DRUM
K19 - AIR INJECTION SYSTEM is this TBI?
K81 - GENERATOR,63 AMP
L0T -
MX1 - MERCHANDISING OPTION ONLY-DO NOT CATALOG what is this about?
M40 - TRANSMISSION,3-SPO AUTO (THM400)
NA4 - EMISSION SYSTEM,HEAVY DUTY
NA5 - EMISSION SYSTEM,FED REQUIREMENTS
NL2 - TANK,AUX FUEL(VAR 2)
N41 - STEERING,HYD(VARIABLE RATIO)
P10 - CARRIER,SPA TIRE
SLK -
STL -
UN9 - RADIO SUPPRESSION EQUIP
UP7 - RADIO,MONUARAL INSTL PROVISIONS MONUARAL INSTL?
U37 - LIGHTER,CIGARETTE
U69 - RADIO,AM/FM MONO PUSHBUTTON
U76 - ANTENNA,W/S EMBEDDED
V73 -
XYM - LT235/85R16E, R/PE, ST TL ALS BL FRONT what are the letters after the tire size for?
YD3 - FRONT AXLE, BASE EQUIPMENT FOR SCHEDULING, GVW PLATE also weird because the truck is 2wd no front axle
YD6 - REAR SPRING, BASE EQUIPMENT are these light duty or heavy duty springs?
YYN - LT235/85R16E, R/PE ST TL ALS BL REAR what are the letters after the tire size for?
ZN3 -
ZYN - LT235/85R16E, R/PE ST TL ALS BL SPARE what are the letters after the tire size for?
ZY1 - SOLID PAINT
Z53 - GAGE.VOLTMETER,OIL PRESS & TEMP
61U - PRIMARY COLOR, EXTERIOR, TAN
62I - INTERIOR TRIM, LT SADDLE
62V - TRIM COMBINATION, VINYL, LT SADDLE