I was actually referring to the side brush seals, part# 1087820198. I was able to source them from an auto haus that apparently is in AZ.

My question is which side of these seals face upward (toward the sky), this thinner side:



or the side that is thicker and has more felt:




I sourced some of the smaller feet from a local Mercedes dealer. I had to order them (they weren't in stock), but the parts guys said there were still ~50 in the country. They weren't particularly cheap but not too pricy either assuming they last for another decade.