Hey guys, apologize because im sure this has been asked and answered a million times but i just cant seem to find via search. Ive read all about the difference in backspacing between the s197 and sn95 bullitt wheels, my question: is there any way to tell the difference without actually measuring or knowing what car they came off of? Example: im trying to source a set of wheels form craigslist for my 03 grand marquis. many of the people im dealing with arent able to tell me what car the wheels came off of and are unwilling to take measurements for me. is there any tell tale sign i may be able to identify the difference from say a photograph? I did find mention about the valve stem placement but what i read was vague. can anybody help me out?