This is the first oil change on my 1LT LLT V6. It had 1,514 miles.
I agree about the "O-rings" being re-usable. There's really no need to replace servicable parts.
The cap has a blue silicon O-ring that forms the primary seal to the outside.
There are rubber "grommets" on each end of the filter element itself that seal the clean side from the dirty side oil passages.
There is a second rubber "seat" at the base of the filter housing. The top cap seat is machined aluminum to allow the element to rotate upon re-installation/tightening.
Note the threads on the cap...They are not full circumference. I can only assume that this was done this way is to allow some oil to flush/coat all the cap's threads to make subsequent removal easier.