The GC2 joystick controller D51157 .01 .03 is made by penny and giles. It is currently used on some pride jazzy select models. It has a 4 pin plug at the end of the joystick cord. ELEASMB7226

They are not interchangeable with the earlier 3 pin models. The GC2 has a 4 pin plug at the end of the cord.