I found a little bit of the mayo in the return pipe. None in the others and I have not autopsied the CCV yet. I suspect that warm weather driving may have cleared a lot of it out. I never had any driveability issues other than black smoke at startup (in winter only)and higher than normal oil consumption (previous e39). All the smoke issues clear up in the summer. This was primarily preventative maintenance.
I ordered my parts from Bill Dodge BMW in Westbrook ME because I wanted BMW parts. They offer ~40% off the RealOEM list price. I think I paid around $135 for everything I listed (except the O-ring which I bought locally). Call them (207-854-3200) and ask for Dan in Parts to set up an account (no cost). That's it. 40% off everything.