Backspacing for 13x7 on 1st gen CRX Si?

I'm in the market for some new 13x7s for my 1st gen CRX ITA car, and was wondering what backspace folks are using... The current wheels I have rubbed (ok, they self-machined a bit) on the inside, so I was wondering what other folks do to make a 7" wide wheel fit under a 1st gen car.

Thanks,
-noam

Sorry, I can't help with the 1st Gens. Just in case, though, my 5th Gen Civic and 2nd Gen CRX both use a 38mm offset.

-Tom