ALSO look closely those rims say AMC not AMG it might not bother you but it would bother me to the point of buying some used sl rims not mark off AMG rims... Just pointing it out.
HERE IS WHAT I FOUND GET THEM WHILE THERE HOT $650, $70 for shipping same SL 18's.
http://www.mbworld.org/forums/showthread.php?t=208697