3/4Ton 16" Steel Wheel Question...

[chevyguy8]

I just inherited my dad's 1980 3/4Ton Sierra 5.7L, long bed. Its 100% original and want to keep it that way at least for now.

Right now it has the 16.5" rims which i want to change for some 16", more tire choices.

Are there any factory 16" steel rims that would fit my truck? I want to keep the same width, 6-7" and be able to reuse the original hub caps. Is this about right? Would I be able to find these wheels? Did any other years have these sizes? I really dont want to go aftermarket.

Also what were the stock tire and wheel sizes for this these trucks.

Thanks for any help, Ill post some pics of the truck later.