[68Timber]

The rear doors are much narrower, I would be surprised if they fit. Plus LMC nor Rock Auto showed them available but listed them for the front.

We have a classified section here. Best bet is to check it daily. Check ebay daily, you'll have to be creative about what years you search for and search several different ways. And check any junkyards near you. There was a time when square parts trucks were extremely common. We're not there anymore but they're nowhere near rare yet. Just be diligent about looking and you'll find one pretty quick.

And welcome to the forum. Post up a pic of the truck when you get a chance.