Join Date: Mar 2008
Location: New England '13 XTS Platinum
The shop manual doesn't show the retainers, nor do the parts lists I've checked out online, so I can't say what type they are. It does describe them as male retainers that fit in a female receptacle, and cautions you to place the trim removal tool between them rather than under the female receptacle to avoid damage when prying them apart. The book recommends starting with the aft-most retainer about 2 inches from the bottom of the door. and working forward.
Hope this helps.