I hate having parts left over! A blown out plastic radiator tank on my E39 530i (same engine as our 330s) has led to a ton of "while we're in there"/preventative maintenance with the help of my mechanic buddy.
While doing the valve cover & intake manifold gaskets & SAP vacuum line replacement I have two of metal these clips left over. The closed end looks like it's supposed to push into something! RealOEM says there are three required, so I wondered if anyone has a photo or good description of where these are supposed to reside. #10 in the diagram below. Thanks in advance!
EDIT: Thanks to Vas, I found them - on the fuel rail to hold the oxygen sensor connectors in place. They are oriented vertically in small cutouts.