Been dealing with this and found this to work. 8in rim will need 5 in back spacing. 7in on the rear will need an actual 4.5in bs. Any tire with 10.5 section width should work. Mine is 7in rim with 4.5in bs and 275/60/15 MT radials. I have 5/8 in clearance on body side and the same on the spring side. No rubbing in or out so far but it is close. Id probably stay with 255/60 to be safer than what I did. For the front 7in will work but seem a little wide. I'd go 6in on the front.