Well, for a 1979 Toyota pickup Rock Auto lists the four different starters.  I’ll try contacting them on a weekday to see if they can help me narrow it down.

go to rock auto. enter your truck. thats the starter you need.  

You need 185R14 tires, with C or D load rating. Most of us buy a set online, get them mounted locally… lots of “normal” tire shops aren’t used to this size and struggle to make sense of ‘em. 

Example of popular, affordable choice, which you can Google: Thunderer Ranger R101 All Season 185R14 102/100Q D Light Truck Tire (found at Walmart, among other retailers)