These are a pair of keyboard mounting brackets to fit the Ultimate64 board into an old Commodore 64C case. The fittings fit over the existing boxes and are fixed with screws. The right bracket fits over the PCB, rests on the joystick connector and makes room for the keyboard connector. When screwing the keyboard down, make sure the screw doesn't puncture the keyboard wires, or use a smaller screw. The parts should work with any similar sized screws.
The product was designed by
crashmeplease