The Rock-ola Key Plate or Push Button Switch Assembly part number 42757-A is used on the model 431 and 434.

I took this assembly apart because I needed a latch solenoid - it was excellent beforehand.  It could be easily reassembled if a bad condition but complete assembly was at hand.

The parts that are needed to make this complete are the latch solenoid, the long metal mounting  plate, and all of the screws.