XRAY X4 3X5.5mm Top Deck Hex Screw. These replacement top deck screws are intended for the 2022 XRAY X4. Adding more screws to the rear part of the top deck will reduce rotation and increase stability. The car will have more grip and increased stability. Adding one or more screws to the front top deck will stabilize the car both on and off throttle, however, it will reduce steering. Package includes two top deck screws.