if your wheels are toast. I have a set that would work with only 13k miles
they are not 15s. there 18X7s +45 with 225/55-18 they should be the 2005+ mustang diameter if not slightly larger. and prob much more efficient then 275s.
let me know if yer interested and you can test em out.
I picked up 19s and im getting 16s for winter so these will be of no use they were the oem they have a nice flat lip for a lexan wheel cover.
btw. if you dont mind me asking whats your budget? I can atleast help you source some 15s
