Video Card Replacement Fan Help

We just purchased two Dell computers with nVidia, Quadro FX 3450, 256MB dual VGA or DVI cards in them. The computer is quiet as a mounse, however, the fan on the video card sounds like a MAC truck.

i'm having trouble locating a compatible replacement fan seeing most after market one's i find are for the GeForce series.

Here is a picture of my card and the loud fan:



Any help in finding a website or company that makes a quiet replacement fan for this particular card would be greatly appreciated. Thank you!