You gonna need this one to retain the OEM camera:
AX-TOYCAM3-6V
Its the 24-pin connector. It comes with the 12v-6v converter so you drop the DROK unit. Yes you need a converter as the OEM camera is 6v. You also gonna need to a wire to pin 2 on the 28 pin connector(AX-TOY28SWC) for the reverse signal and one to pin 17 for the speed signal. Don't forget the antenna and USB adaptors!