Well, Max, looks like your production date was May 1980, just shy of the changes that occurred in August of that year. So, you should have the non-split transfer case with the attached parking brake, etc..
So, among other things: The original paint color was the later dune beige shade; as mentioned before, the plaid vinyl Middle Eastern spec seat covers, the chrome bezel, chrome front bumper, and chrome insert in the windshield weatherstrip were all part of that "package"; the lower geared 4 speed transmission; and your differentials came with 3.73:1 gearing. My research indicates this was all "standard" for the pickup trucks delivered to the Middle Eastern countries.
Of course, anything can, and does, change after it has been owned for so many years, but it looks like you may have retained all the original stuff.
Your fog lamps were a frequent option, but the heater would have been rarely chosen for that desert market.
I am interested to see what engine head casting numbers you have as well as the carburetor code.
How about a photo or two of the engine bay when you get a chance?
BTW, there is a 2-piece black plastic clamshell that fits over the steering column between the dash and the steering wheel. I didn't see it in your new parts, so you might want to consider getting it.
Good luck with your project !