Fuel Injector question

[westchase19]

So I'm mid way through changing my lower intake gasket on my 92 4.0. I've got the fuel injectors off the intake and I ordered new o-rings for them. But as i was wiping off the grease and dirt off them I noticed that three of the injectors had these rubber cup/sleeve type things on them that looks like they sit in the intake. Anyone know what these are for, and which injectors need them and which side of the intake they go on? I got in a rush and didn't notice which ones they came from. Thanks friends!

 

[adsm08]

Got pics? All of your injectors should be the same.

 

[westchase19]

I will have to post some tomorrow.They were all six the same just three had these seals on them. I've looked everywhere and cnt seem to find them. Someone said they may have been adapters? But idk why I only have three.