R-Design Futaba 4PX/7PX/10PX Steering Wheel Adapter. This adapter is an option for the Futaba 4PX, 7PX or 10PX transmitters allowing you to mount the R-Design Sanwa M17/MT-44 Ultrawide Transmitter Steering Wheel. Package includes one Futaba 4PX/7PX/10PX steering wheel adapter.