1 box protector for Pokemon Pinball Game Boy Color NTSC box.   There are other that should fit perfectly and some others that would go in and be a little loose but this may be the best solution for them.     If you find any others that fit please let us know.   

Fits Star Wars Episode 1 Racer

Zebco Fishing

This one is 5 1/16 x 5 1/16 x 1 1/4 or roughly 12.8 x 12.8 x 3.1cm. 

14mil Acid-Free Archive Grade PET Plastic

Removable Peel Film

Crystal Clear