The hitch odyssey is something we've been through several times. Absent Westfalia running another batch of OEM hitch kits [not likely], or finding one off a wreck/parts car, you may be SOL. If you aren't expecting to tow anything close to the Class III and E53 rated limits [3 tons on my stick shift model] you may be able to get by with an aftermarket, but I would be very leery about towing anything important [or heavy]. If its a bike rack or towing less than a ton, maybe?

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.