Thanks for clarifying you have a W115.

The correct MB part number is 1156780820.

The MSRP for the factory part is $167.
It is available at Peach Parts, as well as any physical or online MB dealership parts department.
I like MB oem parts dot com.

Factory parts are usually the best choice for longevity, especially rubber parts.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

thanks!

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1976 Mercedes 240D, unknown mileage
1992 Dodge/Cummins 4WD, 284k