This is a reproduction based on photos and some guesses. The size is based on the dimenions of the morpher coins by Charles Roland on MyMiniFactory (link below). It features a built in disc in the middle. But no way of attaching to a costume (yet?). It was fun modelling, and it looks and feels better than the photos let on.
I printed the stickers on photo paper based on the recesses. They ended up a wee bit too big and needed trimming. I've posted the Illustrator file but haven't fixed it. My printer isn't quite detailed enough to print the medallions or terribly fine lettering.