Confirm with your dealer, but I believe these are the part numbers for non-M models.

Trailer Hitch Kit-Class III(PN: 71 60 2 156 527)
$500.00

Ball and Tongue(PN: 71 60 0 413 358)
$45.00

Metal Bumper Trim Piece(PN: 71 60 0 443 105)
$25.00

Receiver Cap(PN: 71 60 0 303 882)
$8.00

__________________
2013 X6M Sapphire Black-current
2013 Audi S4-current
2007 BMW X5 4.8i (E70)-sold