No sunroof. Trunk gets quite wet.

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

In that case you need to check trunk seal, taillight seals, and rear window seal for leaks.

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Don't Chrome them; polish them

I did do a quick search before posting the link to the seal at Pelican.
The internet states that w123 chassis goes from 11-1975 to 01-1986. This led me to believe that the OP's 1976 240D was in fact a W123. If that is the case, then the seal linked is what he/she/they are looking for and will work.

If the OP's 240D belongs to some other chassis group, then I suppose it will not. My bad.

I too was mildly confused by the term "windshield" as used to describe a rear window seal. I solved this by contacting Pelican directly and clarifying that the seal was in fact for the rear window. As previously stated, I have since purchased the seal and it has been installed.

I second that. I'll also add that water can get in via the front/upper corners of the trunk opening in the body. There's a joint between panels there, and sometimes the sealer fails.

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- Greg -
1973 220D, The Prodigal Benz
1974 240D

My 240D is a W115 body, not the W123.

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

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