"Replacement carbon fiber or fiberglass rear quarter panels for the Nissan 370Z. These rear fenders are approximately 10mm wider than stock, taking advantage of the already very wide rear track of the 370Z. No cutting is required but it is recommended to take full advantage of the weight savings. These fenders help you to loose weight as well as provide the ability to have replaceable quarter panels if yours get damaged."
Linkies
There was a thread a while ago about widening the fenders, and I think an additional 10mm would give some DD's a little more aggresive stance without the 'rice'-worries of rivets or whatnot.