trim

Can someone help me identify the trim part number in the photos below (yes poor quality as screenshot from walk around video). Right rear tire. Getting quoted $1200 to replace by dealership.

Has anyone successfully changed out their interior B-pillar trim? Do these part numbers look like approximately the correct ones to do so, if I wanted to replace base plastic with Race-Tex? Door pillar post trim set (right) Door pillar post trim set (left) My vehicle will be a 4S CT, Slate...