Specifically for use in the DeepCool Matrexx 50.  Use two case screws to attach the bracket through the SSD drive holes location as shown in the pictures.  Its a good case for the money, but the screw holes strip out easily, and the back expansion card area is a little weak to support a 5 lb. video card.  I created this support to fit existing holes in the motherboard tray.

I'll attach the Fusion360 file so you can edit the space between the bottom of the inside of the case and the bottom of your graphics card.

*if you have this case, and you message me to create a bracket (for example) “38mm from the inside bottom of the case to the bottom of my video card",  I'll whip up the .stl for you.