here are the ones that the rpo decoder didn't decode:
1AY
B9K
YT9
E6N
GE8
GE9
TT5
WU1
59L
92P

well, actually it decoded 1AY, YT9, and B9K, but it just came up with question marks.

also, the rpo decoder listed 59U as exterior orange metallic.

my car is an 84, and the paint codes are wu8509 for lower and upper, which should make the 59L and 59U show up as beige in the decoder right? also, is there an official name for the 8509 color or is it just beige?

furthermore, there were some options that decoded that i don't really understand -

UL5 - radio delete

am i not supposed to have a radio? or does this have something to do with the U35 clock option?

also, are the 53A stripe color , accent, two tone, black/gold met and D88 sport stripe the same stripe?

thanks guys.

 

1AY : STOCK ORDERS PROCESSING OPTION (DEALER ORDERED CAR)

B9K : ORNAMENTATION, B/S MLDG, REAPPLY TO RR DOORS ONLY

YT9 : OPTION PACKAGE, FISHER FURNISHED PARTS

There's a few, let me go see if I can find the others...

EDIT:
59L - Silver Beige Metallic secondary (lower) exterior
WU1 - INSTRUMENT LIGHT SHUTOFF SWITCH
TT5 - HEADLAMPS,TUNGSTEN QUARTZ HALOGEN
E6N - COUNTRY ABU DHABI
GE8 - FLEET INCENTIVE RYERSON-TULL (C/G/H/U/W-TRK CK)
GE9 - FLEET INCENTIVE AMERICAN AXLE & MANUFACTURING (F-TRK CKGMLST)

There you go. I'm not sure about the last three there though. Seems like the fleet incentives were for trucks, and Abu Dhabi, well that one just seems wierd... Also, I could not find 92P anywhere... Well, I hope that helps some, though it might bring up more questions than it answers... Maybe some one else has a more reliable source for these codes...? I just googled "gm rpo" and looked through a bunch of sites till I found the codes...