I probably have the product name & brand written down somewhere, but when I needed to install (NEW) the trim retaining clips on the back window in my Diplomat coupe I used the following setup: special rivet which is installed using a depth pre-set rivet gun head. This positions the rivet with enough installed height to allow the clips to be mounted.
I used washers on the back end of the rivet (so the rivet head that holds the setup in place) to toughen it up a bit and give it a solid mount that wouldn't move. Not that otherwise it would, but I just didn't want to see these clips come undone.
1) that's the setup
2) this is the purpose rivet gun head
3) and this is how the rivet mounted in that head looks like
Worked out very well. No problems with the installation, very solid:
4) here is a side channel with a few of these installed
5) and here is a close-up on how the retaining clip attaches to it, pretty much an OEM like install