Rear Window Trim Clips

I've got two questions on these trim clips for my '66 Dart GT.

1. What type of sealer do you guys use on the screws for these clips? I think they were coated in some type of wax from the factory. Will a urethane seam sealer work?
2. What trim besides the rear window used these clips? I'm counting 19 holes for the rear window, but I seem to have 26 clips. Are these anywhere else on a '66 Dart GT? It's been a while.

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