There are a couple of steps to to replacing the wheel tray PN 8880694
Step 1: Remove the outer cover of the end cap. To do so, use a flat bladed screwdriver and pry upwards at the points indicated by the arrows in the image below
Step 2: Once the outer cover is off you will need to unscrew the inner end plug, (see image below), which will require a 5/32 tamper resistant hex wrench available from us here, or find one at your local auto part stores or better hardware stores.
Once that is removed simply slide off the old wheel tray and slide the new one on