Duster 275/60/15

Thanks for all the info. After a little more thinking and going over the measurements and math again I am going to go with a custom 4.5 back spacing. That will give me 0 offset on the wheel. I have 5 3/4 to the leaf springs and just a touch over 5 1/2 to the quarter lip. The tire I am getting has a section width of 10.7, so a 0 off set wheel should center the tire nicely in that just over 11 inch space.