2021 Lexus IS350, Ep 4: EASY Oil & Filter Change 

Also, you got lucky just using the ratchet to take off the filter- that is for draining the filter before removal - you actually may need a special filter tool to remove the filter housing.

The plastic part is used for draining the oil filter cup and the o-ring is for the square drive cover. If you didn't open it this time you don't have to replace the o-ring but should do it every oil change. It helps you empty the cup with out making a mess like you did when removing the oil filter cup. Give it a try on the next oil change, if you don't want to do the extra step then replace the o-ring at least once every other oil change. Very rare they leak though.

It takes 6.8 for the AWD