That’s what I thought as well but could not find one. I recall Arcadeshop having them but did not see one on their site.
Let me know if you have a link to one.
Good thought. I have a Galaga filter board and there are a few connections from the edge connector that does not pass thru to the game board. I added wires to connect them but looking for an original Bosconian filter. Just my OCD. :)