Spring re-location?

I had a used 245/60/15 lying around (without a rim), so i decided to do some mocking, i sat the tire in the well & centered it (takeing the drum off), with the edge of the tire about 1/4" or so from the springs, its showing just shy of 4.25" for back spaceing, but theres a good 1.1/4" from the outer tires belly to the lip molding ( i'm good there), so it doesn't look like a 15x8" wheel with a 4.5" BS will work, i'm sure a 255/60/15 will fit, but on a 4.25 BS at max (maybe), looks like a 15x7" with 4" BS would work best, from what i've heard around the boards, thats what most are running with stock wells & spring location with a 255/60/15 MT, the 245/60/15 has about a 10.1/4" section.

The 255/60/15 MT has a 10.7" section, & the rim sizes are 7-9" recammended, don't know what size rim they mounted it on to come up with the 10.7" section, maybe it was an 8"