You might be able to pull it off without spacers there only .5" wider than stock 17". BUt I am not sure, you can always call up a tire shop.
Hope this Helps!
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house