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Dave, the best way to fill out the rear fenders is to get 16 x 8 rear wheels. Yeah, baby! I think the 8s should have been standard on the 78-89 911s, they work so well and look so great (actually, I think they were standard on the '89).
Unless you get really involved, you are not going to have much luck with spacers. You CANNOT simply slide a thick spacer on, and bolt the wheels on. The stock studs are not long enough! I think the biggest you could safely use is a 1/8 inch spacer, which would hardly be noticeable. If you put a thick spacer on, you will be causing a serious safety hazard, because your lugs will not be threaded on far enough. There is a spec for how many turns the lugs need. I think it is 9 complete revolutions. Just be careful with this. Remember, the factory made the stock studs a certain length, and this was done WITHOUT taking into account a spacer being used.
Of course, you could always install longer studs, for instance if you put in studs that are in inch longer than stock, you could safely put on an inch spacer. That's what the factory did with the 911 Turbos. But, this is a costly thing to do, for the studs, spacers, and labor. You'd be much better off just getting the 16 x 8's.
There are also aftermarket spacers that have new studs built into the spacers, and you bolt the spacers to the hub and the wheel to the spacer. These are usually pretty costly, and I would not trust them personally on my own car.
Brian
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