I assume you're talking about your 240d, yes? If so, a quick search brought up this. It pertains to early 300d, but i think the delivery valve arrangement is the same.
The 240s I've looked at look the same as my 617sd engine, but I may be wrong. Due diligence here with the search function should bring up what you need.
http://www.peachparts.com/shopforum/showthread.php?t=260604&highlight=leak+delivery+valve+seals