When I was doing this job last I remember pulling out a long rod like thing and seeing atleast one o-ring on this rod. There may have been two, not sure. Anyway my filter kit had no such tiny o-rings so I just reassembled it but I want to get these for my next oil change. I did not even touch them but they looked worn.

I read about these getting brittle and need changing. My oil pressure is fine on idle. In center of range when hot then pins when I take off.

My question is:

1. How many are there on this rod. One or two?
2. What are they for.
3. I can't find them at Phils, anybody can find them for me? I'd appreciate it.

I see others get them at hardware store but I'm not sure what size or material to get. Anybody's help would be appreciated.

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1982 300SD