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Your rears are 8 inches wide, mine are 9-70. The fronts are the same at 7-55 so get a 1 inch spacer for those. For the rears, I would jack the car up, put the new wheel in the opening where you want it and measure the distance to the hub from the lug nut flange. This measurement will be the amount of spacer needed. Obviuosly, take into consideration the oil lines,, trailing arm adjusting bolts and the outside fender lips. I am sure there is an equation you could use but I found that seeing it on the car helps me more.
Or you could just use the search function here. I am sure someone has put these exact wheels on an SC before.
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1981 911SC ROW SOLD - JULY 2015
Pacific Blue
Wayne
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