Well there is a 300D near here with rust free doors and 3 of the regulators. I'm going to head out there this weekend and see if I can grab them out of the doors. Unfortunately this is an LKQ yard and they nickle and dime you for every little thing. I learned my less pulling a manual 4 speed out of a 280E Euro there. By the time they counted everything I paid close to $450

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1978 Mercedes 240D
1981 Mercedes 240D
1982 Mercedes 240D