[DuaneL]

Another good book is the illustrated Caballero parts book (Model 5aw80 or 58A) can be useful to figure out name and parts number for parts you need, then an internet search of part number can identify other cars it was used on and revised parts number.

 

[DuaneL]

All the hits I am finding for these model numbers are for 1982 or earlier.

Do you happen to have a link to one? So I know what to keep an eye out for.
Thanks

this one is a bit pricy but shows that it does exist with a bit of searching might be able to find it cheaper

https://www.faxonautoliterature.com/1978-1987-GMC-Caballero-Parts-Book-Original

78-83 a little bit less

https://www.faxonautoliterature.com/1978-1983-GMC-Caballero-Parts-Book-Original

more reasonable price (but out of stock)

1978-1987 GMC Truck Dealer Parts Book Catalog Caballero Text & Illustration GM

www.autopaper.com