Man I feel for you John! To the best of my knowledge, there is only one way to measure backspace. Lay the wheel face down, put a straight edge over the barrel and measure from the pad up. Dave from Forgeline has a nice vid on the 48hour Camaro site:
If I'm in your shoes and the BS doesn't match what I ordered using that method I'd be all over the vendor.
Good luck and hang in there!
