You can use all Chrysler remote controls and US Marine controls up until 1994-95.
Then Brunswick started to put on Mercury LU and ignition system.
The remote controls then had Mercury style connectors.
The 2 balls are the connection points for the ends of the shift and throttle cables.
They take 2 special connectors.
Both are available, Ebay has them.
One ebay theif is selling the throttle one for 50$
If you get the controls, they sometimes come on the end of the cable??
I sent you a PM.