OEM JZA80 Supra Radio Bracket Screw w/washer.
These tend to be either missing or hard to fine being such a small thread pitch. Most people find this out when upgrading their head unit that a previous person has lost these or tried to replace with the wrong screw / bolt.
Note: This doesn't come in the original packaging as I buy in bulk. This listing has two options for a single screw or a set of four.