Battery box for Ernie Ball Music Man instruments built after to July/August 2012 (dates are approximate). The easiest way to determine the correct replacement battery box is to check for a Music Man logo on the battery box door. If logo is present, this is the correct 9v battery box.
I just a message with Billy Imperial @ Ernie Ball and he is familiar with this guitar. I'm sure he will be able to help get the parts I need. I also have a 1978 Sting Ray bass that may need some TLC