Replacing the injectors on my 1993 400e. When I pulled the old injector about half of the plastic holders that the injector goes into pulled out. The others didn't and are pretty brittle. They also seem to be shoved in the pretty tight. So my plan is to replace the holder/insulators (which term is actually correct?) on all of the cylinders once I get the remaining ones out. Upon pulling them out I keep reading about having to replace an o-ring that goes with the holder? These holders didn't have any o-ring, just a plastic piece that tapers to go into the engine. Am I missing something, or are the O-rings part of the holder itself? My new injectors have both o-rings on them and seem to fit snugly into the holders that popped out, so I'm guessing that's good.
Thanks in advance!