4.6 Flares Help!!

[2002Silver4.6is]

I have a 4.6 with the flares. I am replacing one of the the "Bumper Supports" (Part #2: http://realoem.com/bmw/showparts.do?...22&hg=51&fg=15 )

The one that I am replacing had a bolt (no idea who the hell did this shoddy work, I am the second owner) securing the Bumper Support in the hole that is at the lower end of the piece.

I have been to the dealership to buy the correct fastener to mount the Bumper Support but they do not know what fastener I need. The diagram does not show which one to use. It does look loke a large plastic rivet on the one securing my other Bumper Support.

Anyone know what the part number is for the fastener????