Finally something I can help a fellow mopar junkie with! They are caller back glass spacers and go on both sides on the bottom of the rear glass opening and holds the glass from drooping down to the bottom and hitting the clips and the little studs or screws as in most cases the studs get ground off. Not a fan of the style clips or screws in your pic. A different style is available that actually screws in tight then the clip slides down on it. The style you have there, if you screw the clips down tight I doubt the stainless will snap in place without damaging the paint. I just installed the same ones you have, I haven't installed the glass yet but was not impressed with it.
over the years I have collected all kind of stuff I knew I would need, ended up with 2 sets of that style and couldnt put my hands on the other style I bought but couldn't find. Just fyi after drilling make sure you use some style of corrosion protection and sealer around the screws