What I'm trying to tell you is that those codes you can't find or figure out are BUILD codes not option codes. Your not able to decipher from option books because they are of a differant set of codes. The build codes are for stuff like "computer selected suspention" and "speedometer key delete","Less Sleeve",ect. They aren't really Regular Production Options. GM never published those codes cause they not nessisary in determining options because those codes aren't for optional equipment. They're used by the plant on how the core of the car is assembled. Get it?on 1985 and later units these codes are all on a sheet glued to the inside of the glove box door. That was not all of the ones that I could not find, the list is quite long and I found over half of them.