Greetings, eh?

I'm looking to do a similar fix to my car. Are these O-rings you speak of for the delivery valve, then? I've got a link to a part on autopartsonlinecanada
http://parts.autopartsonlinecanada.com/parts/apocanada/wizard.jsp?year=1989&make=MB&model=190-D-002&category=D&part=Delivery+Valve+O-Ring

Is this the proper part? I have to purchase something from there anyway, so including five rings on the order is worth my while.

Thanks!

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1995 E300D, 253000+ km - babied by PO, let's hope I do the same...

1989 190D 2.5, 450000+km - first MB I've owned. Bought at 396000km, and now parked.