After a long LONG sleep in a storage shed, the Mustang is coming out and needs new hooves. It currently has stock 10 hole 15" rims, I would like to upgrade to 16" or 17". I get confused with the backspacing required to get a good sized rim and tire inside the wheel well without any rubbing. The car has been dropped 1 1/2" on some maximum motorsports springs before the lenghty storage.

Any help is apprciated!