Help IDing a part on the fuel injectors

[Dhan]

Sorry if this is in the wrong spot, but it seemed like a pretty newbie kind of question.

Recently took the head apart for a rebuild which is moving along nicely. However when I was removing the fuel injectors from the manifold, there were four little plastic collar/seat sort of things that went around the fuel injector nozzles where they met with the head.

I noticed though, that two of the four plastic collar things were missing. I didn't drop them or anything, so I was wondering if they were ever there or if someone else lost them.
Does anyone know what the part number is or what they are called? The manual doesn't seem to list them.

Thanks

 

[GSXSixteenG]

Pintle Cap.

 

[Dhan]

Awesome, thanks man.

For anyone else looking, here's a good source...part #3-117.

http://injector-rehab.com/outpatient/injectorparts.htm