I changed out my reverse lights for some LEDs and ended up breaking those plastic retaining pins also. If I remember I think I found some factory ones, but of course, they had that Mopar premium tax added.

Ended up purchasing this kit off Amazon: https://www.amazon.com/gp/product/B07L6FJGR4/ - it had a selection that fit the bill. The whole kit ended up being less expensive than a set of factory replacements.

probably a mopar specific fastener. But I'm sure you could replace with one of these

That plastic is very flimsy because no one ever sees it, and the only time it's ever accessed is when mechanics need to access the car computer, the ignition wiring, steering column, etc. In many older cars, they didn't even bother to include a plastic clip panel.

I always take panels apart for custom car audio, so I bought a whole set. If you don't foresee the need to buy a whole set, I think you can walk into like an AutoZone, Advance, etc. and buy individual clips.

Honestly, it will probably never be a problem without that one clip