My M104 head is at the shop, my usual source for MB valve stem seals is too slow. Anyone know the OE make on these? I really prefer to use factory seals whenever possible, but I'm also in a bit of a hurry. . .

Bruss or Corteco are the most common OE sources for valve stem seals.
Most likely the dealer is the best way to get OE!
Elring, Reinz, or Goetze are not OE.

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I ended up snagging them from the dealer, but I was curious about Hebmuller - I know they're German, but none of my sources actually listed them as the OE. . .