Where are My RPO Codes?

[97350]

I just bought an 83 Silverdao 1/2t that has roughly 85kms on it and has been parked since 1990 with a dead engine.I looked in the glove box hoping to find a list of options but there was none.Where are the RPO codes on this truck?

 

[89Suburban]

That's where they supposed to be.

 

[towjoe]

Not always true. I've seen alot of them on top of the inner fenders on the drivers side in the engine compartment. Just Junked a 83 and that's where they were. Good luck being able to read them tho, was a bad place for them