If the shifter mount plate for your Conquer Racing Simulator Seat (see Step 1, fig. 2 of instruction manual) is missing its threaded hole, you can use an 8mm hex nut (M8-1.25 thread size) in its place. Line up nut with hole. Proceed with attaching rail piece to base piece per the instructions.

Locate hole on shifter mount plate. Line up nut with the hole, proceed with attaching rail to base.