I initially replaced my driver's door seal with an aftermarket seal and the door would not close properly. There was a hard rubber bumper within the seal itself for some reason. The seal I bought for the passenger side was the same so it wasn't just an issue with that particular seal. I bought two new seals from MB. They didn't have that bumper and they allowed the door(s) to shut properly.

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1987 300TD 231,000
#22, afterglow, plastic fan, euro lights, alternator upgrade, cluster housing update