I have the following which fits perfectly on a 2WD C20:
265/75/16 on 16x8 w/4" backspace on the front
305/70/16 on 16x10 w/5" backspace on the rear
I know that's a little different wheel size from what you're looking for but you can still calculate equivalent width/diameter dimensions with a typical calculator like this:
https://tiresize.com/calculator/
By the way, "Mike C" was one of the guys who helped me out when I was trying to figure wheel/tire sizes for my truck - thanks, man.