Review on YOSH Magnetic Car Phone Holder Metal Plate Replacement Kits - Adhesive Mount Plates for Magnet Cradle Mount, Compatible with Magnetic Holders - Pack of 4 Round Metal Plates - Black by Brian Davis

This was exactly what I was looking for for my vent clip. I got a new phone and with it a new case so all I needed was the metal disc as it worked great on my old case. I missed that the back of my new case is textured and not smooth like my old one. The disc held up well in the holder, but my phone slipped out in the car. Realizing the problem, I decided to just glue it with Gorilla Super Glue. The covers are cheap enough that I can swap them out if needed or take them off at some point along the way. Just note that they might not attach as well to a textured case but other than that they are great and very good value for 4 of them. In general very satisfied!