I don't believe that Meyle is an OE company for MB, but they do make a lot of replacement parts. I am only familiar with their rubber door seals, which I can tell you are of lower quality and poorer fit than the seals that you get from MB.

While probably better overall than Asian or other offshore parts, I don't think Meyle is as good as typical OE MB stuff.

Don't know about Metzeler.

Cheers,
Gerry