Do you mean 31,0cm x 14,5 cm x 4,7cm? (lenght x height x thickness)
if thats the case it will either not be possible, in need of a mod, extremely tight or i have to think about something else as a case. Card is 24,8cm x 12,3 cm x 5,5cm and has a 2 Slot bracket. But thanks to @Crossfire Machines...