Help ID’ing BMW Roof Rack Crossbars

[Gitarzan2]

Hi, I’m seeking help identifying a pair of BMW Roof Rack Crossbars that I found in my late Uncle’s Storage locker. They have BMW logos on the ends and on the inside of the ends they are marked E53. There is no BMW traditional part number sticker which I believe usually starts with “827”. They may be a Thule product but I’m not sure. The Tool used to tighten them is identical to Audi/VW Crossbar tools with the exception of the BNW logo.

I’ve done extensive image searches and have not been able to find these particular Crossbars.

I’m especially interested in determing the exact part number so I can possibly replace the missing rubber end caps (I know it’s a long shot) and then get these to someone who can use them.

Any help would be greatly appreciated! I’ve included photos. (Sorry about the photos! I’m having trouble resizing them!)

Thanks, Gary