They are for BL stuff, maybe Ford as well. Everyone knocks BL stuff but the bits were always good. If it came in a BL box, it would fit first time and last as long as the original. Now it's cheap Chinese rubbish.
If you wanted that part for a 1973 R107 Mercedes, you'd order via your local dealer, a few hours later a grey haired Herr in Sindelfingen would locate the part, blow the dust off and it would be on its way. It would cost 4 times as much as your Chinese rubbish, but would last 20 years.
I was surprised that BMW didn't take control of BL Heritage as it was, rinse the cheap shit suppliers out of town and build up a nice little niche supplying good quality Mini and MG stuff.
Also, old Kraut metal is well served by companies like Febi Bilstein, Lemforder etc.