WHat is the back spacing on a 2003 F150 KR stock 17" rim. The guy at Better Off Road told me that if they had anymore than 4.5" back spacing that I would have to get new rims in order to fit 35X12.5X17s on my truck with a 6" Fabtec Lift.... So I am puzzled and cant seem to find what the back spacing on my rim is. I would just measure it myself BUT I am in IRAQ right now and am doing all this Via my friend and he is just relaying what is going on with my truck........