10.5" is probably maximum, but in any case the trick is not width, it's offset. You need to be sure you are buying wheels that will fit, and use an offset calculator to help if you need it. A 7.5 inch wheel might not even work if the offsets are wrong, and a 10.5" might be just fine. All custom made wheels will work, as they make them to fit your vehicle, but they aren't cheap, either.
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Todd
2005 Boxster S - Atlas Grey/Black, PASM, Sport Chrono, Bose
2006 Infiniti M35 Sport
2007 Cadillac Escalade (tow vehicle with bling)
'00 Boxster - 2.7l w/FVD ECU tuning, Moton double adjustable suspension, custom stainless headers, lightweight flywheel, dual Magnaflow mufflers, 18" CCR wheels, 911 front brakes in front, Boxster front brakes in rear, full welded cage.
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