I had a local shop replace my injection pump (I know, I could've done it myself but I just didn't have the time). I now have a boost leak on the firewall side of the grid heater where it mates with the intake manifold.

The gaskets look fine, but there are two round plunger looking things on that side of the grid heater, and one of them is missing.

Obviously I'm going to tell the shop owner about it and have him make it right (he's a very good guy and I have a feeling he had a new guy work on my truck). But what are these things, and if I had to order them where would I go, and what's the proper name for these things?

Thanks,
Mike

 

You can see them in this pic here. They're directly underneath the positive terminals.

 

Nobody has any ideas on this one?