Main priority is to smoothen down the corners, one of the bigger flaws of these bezels. Just have a look at all bezels until (including) frogger, they look significantly better.
Everything else is explained here:
Finally, do not miss out on these incredible new 4k bezels by ArsInvictus:
https://forums.libretro.com/t/new-4k-bezel-overlays/25247/73
On his Dropbox link, you will also find a dedicated MAME directory that already includes the .lay files. With his kind permission, I will include some of his bezels with those of John Merrit because they often match perfectly.
Enjoy and Merry Christmas!
