The filter I just replaced on my latest /5 project came with two rubber ends. I'm assuming those are replacements for the original small black o-rings that went on the ends of the filter, but figured I'd ask the old-timers here.
Also, this isn't the setup with the $2000 white o-ring, it's the other one. Although it appears someone put the $2000 white o-ring around the edge of the inner oil filter retaining plate. Was that a clever mod or just some misunderstanding by a PO?