Racing Pedal Stop

I need to keep a spacer behind my Thrustmaster pedals; I usually use a old college textbook. The design on the back of the pedal's box is like a ramp. When I press on the pedals the book slides up the back and the pedals get blocked by the book. The Pedal Stop V1 prevents the book from sliding up the back of the box. Another problem is when I have the pedals pressed up against a wall. When I use too much pressure the pedal box starts to rotate backwards towards the wall. This prevents me from properly using the pedals. The Pedal Stop V2 prevents the pedals from rotating against the wall.

TLDR

RPS V1: works if you are using a box or book as a spacer.
RPS V2: prevents the pedals from rotating against a wall.