You can order a push rivet kit on amazon to have spares. Very low $ and lots of sizes in a kit. Good to have with some many of these plastic push pins on a Tesla.I tried installing these over the weekend on my new model S- driver side went in no problem, passenger side the bottom plastic rivet refused to go in at all. Ended up breaking it. Now I have one installed and one not. Service said they are willing to assist.
Here is one example https://www.amazon.com/gp/product/B0734RB6XG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1