Quoted from NjayNL:Attack from mars insert panel impossible to find
https://www.marcospecialties.com/pinball-parts/03-9419-500XX
Drill your own. This is what I had to do several years ago, and of course, RIGHT AFTER I did it, they released the 'real' ones. For less money.
I used a step drill to do it and managed to not screw any of it up.
If you don't have your original this of course is an issue.