I have a 69 GS400 Convertible which needs restoration. Came with 265/50-15 tires with oversize rear springs because this tire is too wide to fit inside the rear fenderwell. I have purchased stock springs and am wondering what size of tire will fit inside fenderwell. Would like to have rear tires as wide as possible without rubbing on inside of fenderwell. Wheels are 15 x 7 rallys with 4.25 Backspace.