It looks like your best bet for getting the replacement parts you need would be to go with a new # THKIT3039 fit kit.
I spoke with my Thule representative, and found out that unfortunately, they do not offer individual components of the # THKIT3039 fit kit as replacement parts. My rep went on to explain that Thule offers hundreds of different fit kits, all of them vehicle-specific, many of which use unique parts. It wouldn't be possible for Thule to stock and manage all those spare parts... view full answer...
It looks like Thule is responsible for making the roof racks on your 2008 BMW 5 Series.
Of course, I have heard reports that there were some that used a different roof rack. You should call your local BMW dealership with your VIN number to double check which you have.
If it turns out that you have the Thule rack, then the replacement key for your 020 is part # THKEYN020, and the key for your 013 is part # THKEYN013. view full answer...
The correct replacement lead landing gear leg for a Ground Control 2.0 Leveling System is the Replacement Heavy Duty Driver Leg for Lippert Ground Control 2.0 Landing Gear part # LC241846 for standard (29-1/2" outer tuber body) or part # LC241845 for extended (33-1/2" outer tube body). view full answer...