Thank you, just ordered a set of 2.
Edit:
The original post isn't clear.. if we have the B21 C-board, will any CPS1 A-board work or will it still need to be from the limited list of expensive B21 C-board games?
Here's a complete GnG conversion for sale right now.. I'd be all over this if I didn't already own the game.
https://forums.arcade-museum.com/showthread.php?t=473552