Had my backup camera installed and noticed most of mine were missing. Went to Autozone and got a pack of 15 by Dorman models 799-100 5/16" (7.93mm). Not just push pin, they are threaded with a phillips head. Fit nice and securely. Cost was under $5.

Now I have extra if needed. I am sure they would be at least $5 each from Chrysler.