Tom,
With my Vintage I needed the Empi adaptors to go from 4 lug to 5 lug Porsche (5 x 130). The wheels are real Fuchs off a '73 911S. With the adaptors, the backspacing was perfect and put the wheels out at the same width the steel ones were at. The only trick is the original 19mm lug bolts for the wheels had to be swapped for 17mm to fit in the spacers.
My Vintage is based on a '74 pan if that helps.
Scott