Here are the parts list.

Trailer Hitch Kit (PN: 71 60 2 156 525)
Trim Piece Kit X5M (PN: 71 60 2 185 556)
Blind rivet (Qty 8) (PN: 07 14 9 140 786)

Just remember the current software for the hitch module has a problem with the brake lights not working.

I was able to take a module that was programed in a 2009 X5 and it worked in my car.

FIXED... New software version from BMW (from Oct if I remember correctly) fixes the brake light issue. 4-5-11