Guess this should be solved by now… [br]
You want a connector for a 3.96mm flat/ribbon cable. [br]
I soldered part of a plain hard drive ribbon cable to the cartridge connector, any type of connector could be used in the other end. [br]
It’s an unusual size now-a-days so you probably need to get a little creative. [br]
Solder ribbon cables on the board as well as cartridge holder connector and then add plain press on connector of each gender to be able to split it.