This game does not have a chime box ever. Instead it uses bells in the back box. The Jones plug is probably there for it but you will have to actually buy the 10/100 point bell ( pinball Resource). Then there’s another bell that mounts on the match unit. Again you can buy a blank black bell with no coil, just the bell itself, from pinball resource

It is common for games that were brought back from Germany to have No bells. You will see the punchings in the side of the cabinet backbox wall where the bell was originally to be mounted. But if you look closely you’ll see that there’s never been a Screw in the hole. I don’t think any Bally games exported to Germany had bells

Putting a Williams chime box in a Bally is, Ummm, crazy. They sound completely different. Williams boxes are the worst sounding of the three major manufacturers. Only Chicago coin sounds worse.