What's the rest of the build? Are you adding the case fans to an otherwise completed build, or are you still planning your build?
http://www.anandtech.com/show/10342/the-fractal-design-node-202-case-review/3
So, you can fit two 120 mm fans under the graphics card, provided the graphics card is not too thick. A standard dual slot card is about 40 mm thick and already prevents the installation of regular 120 x 25 mm fans, but you will be able to use 120 x 12 mm and 120 x 15 mm fans, of which there are a few models: Prolimatech Vortex and Scythe Slip Stream Slim, for instance.