[quote name='Tom in Austin' post='44569' date='Dec 12 2007, 12:38 PM']Boxster wheels, esp the 'S' models, are a great fit on a 968. They preserve the 1.5" wheel width differential front-to-rear that Porsche specified for 17s (OEM was 7.5 front/9.0 rear).
I think this gives you a better balance than using 911 wheels, which are typically 7/9 widths. I run these wheels on my 968.
As Ryan says, almost all the newer wheels require spacers in front to clear the hub. No one makes a 3 MM spacer that know of, but that's all you really need. From what I've read you can safely go up to 1/4" (about 6 MM) with the standard studs. The spacer dimension adds to your offset, so with a 6 MM spacer installed, your effective front offset becomes 55+6=61, a bit more than the stock, but not enough to cause any interference between the wheel and the body.[/quote]
55-6=49
Lower the number, the closer to the fender.