K found out some info, called the dealer he had no idea. Finally found an old post, but here is the part number for the E70
RealOEM.com * BMW E70 X5 3.0si Exterior mirror for towing
Made by EMUK and I have sent them an email to see if they have a north american dealer.
If not I am going to try and order directly from the manufacturer so if anyone wants a pair let me know and I'll let you know what I find out.