Finally found them ten miles from my house at the indy mechanic. Cost me $7.00, totally worth it. Got some more coming from mercedesshop too, for the future.

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1985 300D, 237k.
1994 F-350, 6.9 diesel, 5 spd manual, Banks Turbo. 261k.
Sold: 1985 300CD- 267K