This is a pair of left and right side supports that sits on the side hump of the X-Rocker Gaming Chair to use the Xlerator Wheel Stands Regular Lap Bar Wheel Stand. Gives the Xlerator Wheel Stand a place to sit securely on the chair. This setup makes for a very stable and fun racing simulator. It is quite the experience racing rear engine cars having the sound behind and under you. Several picks are of my personal rig for Xbox 360/Forza 4, Modified X-Rocker Pro Chair, XL20 Xlerator Wheel Stand, Fanatec Porsche 911 Turbo S Wheel, Fanatec Clubsport V1 aluminum pedals, Fanatec Clubsport Sequential Shifter, mounted on a prototype low mount shifter adapter. X-Rocker Pro chair modification, put spacers under the front chair supports to tilt the chair back a little bit. Was too far forward for my driving style. Other picture is of the Thrustmaster T500RS with TH8RS shifter on XL20 stand with low mount adapter for PS3 and PC. February 2015, Just downloaded a new listing for Big Boy Lap Bar adapters for the X-Rocker Chair in my things. December 2015, just added two more updated stl file. These look better with the heating plate side hidden on the chair. Have built in support.Screw adapters to the side of the chair after getting the proper position for your body size and racing style. They will move forward and back on the hump of chair. Screw into plywood side of chair with two screws. Can be printed with or without support, but you will want to run a countersink bit into the holes to clean them up if no support.