Dealer only, AFAIK.

It's simple. Yank the old one off, pull out all the little plastic clips,
insert new.

Note: When you remove the little plastic clips, notice that some of them
are a different color, like green or red. Make sure the new one's colored
ones go in the same holes. Once you push the clip in, you will be virtually
unable to remove it again without damaging the rubber, so get it right the
first time.