This is a good reason to stick with genuine MB when it comes to rubber. The list price is over $160 for this particular seal, but you can shop around and get it for less. As I've gotten older, I've realized the time saved with a proper fit the first time is worth paying extra.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.