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O rings are cheap rubber gaskets that go on each end of the plastic tubes. If you have 60k on the car, the tubes and the gaskets should probably be replaced as a preventative maintenance item. A set of six tubes and gaskets shouldn't cost you more than $40 from Sunset Imports (vs. your local stealership, which will charge you $40,000 and take your left nut as well in the transaction).
I was unable to remove mine when I swapped my plugs, but they seemed to be in very good condition so I think the PO swapped them out or new ones were installed when the reconditioned motor was put in the car just before I bought it.
I still have the tubes and will figure out how to remove the old and put in the new when I do a plug swap again in a few years' time.
As far as pads go, finding good pads that don't squeak and don't produce a lot of dust is a real challenge. I run Pagid.
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