Models or options?

[bwood]

It looks like yours was/is 1989 ( K as the 10th digit). I don't know if all Silverados where the same, but my cousin's 90 Silverado had it all PW, PDL, AM/FM Stereo with EQ/Cassette, Int wipers, cloth bench, matching carpet auto, 350, A/C, chrome bumpers with impact strip, and white dial guages (I think thats all you could get abck then). It had steel wheels when they got it but according to the dealer it had factory alum wheels and they sold them off the truck. All of the little 3 digit codes in your glove box are RPO codes, they will tell you things like interior trim colors, gear ratios, etc. Make sure the VIN in the glove box matches the door jamb and windshield. I see GU6 in there, I think that means 3:42 gear ratio axles.