I had an existing AMPS mount in my vehicle and I wanted adapt a MagSafe 'head' to it but didn't like any of the bulky swivel mounts.

This is simple and small.

It uses "Encased Magnetic iPhone Mount Compatible with MagSafe, Sticker Holder Accessories for Wall, Car, Home, Office, Kitchen for iPhone 12/13/14/ Pro Max" magnet from Amazon.

The screws need to be added before the magnet is mounted. I used my existing screws so I'm not sure what size they are. the head was 8mm and length I think was 5mm.