Originally Posted by nhdoc

The best way to find the correct part is to google the M-B PN (from the EPC or off the old part) and then add "dorman" to it (ie 1237202746 dorman). Some ebay listings also show up in the search.

The Rock Auto website does not really cross reference every model of car to these, so, for example mine were for a 1982 240D because that's what google linked to with the M-B PN at Rock Auto's site but when I searched their site for a regulator for a 1981 300TD none was found. I saw the part was cross reference to the M-B PN on their site so I wasn't concerned that it said it was for a 240D and I was ordering it for a 300TD.

As for rivets, there were none needed on the one I got. There seems to be a generic note that says something to the effect that "rivets, if needed will be supplied" but mine was bolt-out, bolt-in. I can't say for the manual ones but I would only guess that unless the old ones were riveted in you would probably not have to worry about it.

I also found the manufacturer's website:

https://www.dormanproducts.com/cgi-bin/vm91corp30r/pagepro_disp.w?clt=hwrap1&pagepro=Dorman%20Products

This also works best if you have the OE part number.