Never used front and rear set of Weather Tech floor liners for the E90.
I bought them and sold the car before I ever installed the liners. I made one modification, I filled the holes with black epoxy because I don't have posts on the floor. You'll have to bid on my ebay auction til friday, if they don't sell, PM me an offer on Friday. I paid $170 for the set.
bid here:
http://cgi.ebay.com/ebaymotors/ws/eB...%3AMESELX%3AIT