i almost forgot you can also get some M series fenders like the ones off the new M3.. they also out on the market (harder to find though)..
JT autobody (and a few others) has the inserts for your fenders you just have to get a shop to cut your fenders, put in the insert, bondo the crap out of it and then paint it.. probably would be cheaper just to get the fender with the gills already in it then have a shop do it