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				Wheel size question..excuse my ignorance, but..
			 
 
			I am looking to upgrade to 18 tires.  I want to stay with OEM.  In the manual it states I need 7.5 J x 18, offset 50 fronts, and 9 J x 18, offset 52 rears.  I was looking at a set on ebay for 8 fronts and 10 rears. The guy selling these state they came off his Boxster S with no spacers needed.  Would this size fit mine and is it the right size?  Thanks.
 docdyh
 
 2002 Boxster with 16 factory wheels.
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