First of all, in the photos, the support have my name on it, but the .STL file obviously doesn't have it.
Now, i've heard about big and heavy GPU'S bending down due it's own weight through time, so I decided to make this support that should fit any graphics card, its made out by two components, the support it self, and a "spacer" that you can slide through the support.
It is 6 mm thick, and holds up to the case using the same bolts that hold up those metal plates. This is designed to match in length a GTX 680, its about 26.3 cm long.
I've had this support for a while and it works well, its not like an aluminium one that you can buy but it's something.
Note: If you want to modify the design just send me a message asking for the Inventor file or just asking what you need, i'm glad to help.