This will be sold as a set in very good condition. Can hold 8 pair of skies, and 4 snowboards:
BMW Railing Carrier (E61) -OEM 82710396333 (82710415052, 82710396333, 82710308452)
Is listed for 530xi, 535i xDrive, 535xi, but I use it with no issues on X3 (E83) and X5 (E70).
Here is the link for details : https://www.fcpeuro.com/products/bmw-railing-carrier-e61-82710415052
Ski Snowboard Roof Rack Holder - OEM Part 82720406587 - 2 sets
Is coming with one key
Here is the link for details for one set : https://www.ebay.com/p/1011120355
Whole set new costs $700+...I'm looking to get $300, my loss is your gain.