Your originals are probably ATE. However, I'd rebuild them rather than replace. It's an easy repair, and the cost for a rebuild kit is only $25 to $30. See link below.

http://www.peachparts.com/shopforum/showthread.php?t=5064

Good luck!

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1976 240D
1987 560SL
2007 E320 Bluetec
1998 C280 (now son’s car)
1982 240D Manual - Sold