These Sega and SNK coin reject credit input thinguses were created by NFG.  Credit is nice if you're sharing them around.

Story of their creation is here: https://nfgworld.com/3d-printing-credit-buttons-for-arcade-cabs/

And if that's not available, they're posted on Arcade-Projects as well: https://www.arcade-projects.com/threads/coin-reject-credit-mech-for-snk-sega-cabs.28390/

Enjoy!