From ASUS's site: http://www.asus.com/Graphics_Cards/NVIDIA_Series/ENGT430DI1GD3LP/
- Unscrew your "large" metal plate (2 sets of 2 hex screws around DVI and VGA ports, pliers will do, and one phillips screw above the HDMI port).
- Screw in the 2 small metal plates that should've come with the card ( http://www.asus.com/websites/Global/products/oFWUy4OBqyNgtdmZ/QV5rfRIW0i5WAl2F_500.jpg )
Alternative: get out your dremel / drill + cutting disk.