Okay so I bought this car about a year ago and all this work was already done. It sits pretty low.. It has a 03 cobra irs swap, 03 cobra exhaust, off-road h pipe, and sn-95 spindle swap in the front. and that's about it. Currently it's running 245-50 in back and 225-50 in front on the stock rims off a 95 mustang. I'm not sure about how much it's lowered, but I'm assuming the it's lowered the back and the front springs are cut? I want to put xxr 531 17" rims on it. Looking at 17x8 w/ 225-45 nitto nt555 in front and 17x9 in back w/255-45. I have no idea about offsets. Could anyone please give me some info about what I should measure or what I can fit? Thanks!