Help Finding Pcv Valve And Vent

Hey All,

I had some oil leaks in a few places so while replacing various gaskets and seals I replaced my valve cover gasket (very minor leak prior to replacement). My valve cover is now leaking more oil that it was before and I am guessing that it is due to my pcv valve and/or vent, since both were pretty old and upon reinstalling no longer feel solidly sealed. My problem is I am unsure about where to purchase some of the parts that are currently installed. I have found #1 (pcv valve) in the photos below, but I am unsure what #2, #3, #4 are called in order to find replacements. Any help?