850-Series 2-pedal (Brake & Throttle) Underfoot Pedal Assembly with Slider System - Tilton Engineering
Review: Sim-Lab Pedal Slider Baseplate - YouTube
The baseplate allows pedals being mounted on the Sim-Lab seat slider, which makes it easy to quickly adjust the position of the pedals relative to the seat.
Pedal Slider Kit for Trak Racer FS3, RS6 and TR8 Pro