40mm fan cooling Mosfets ?

Looking for some easy ways to keep the temps down in my shuttle which don't involve cutting it up ;)

My SB75G2 is the original Rev1 so I'm gonna swap the psu for a silentx and add some heatsinks to the mosfets. I've also just ordered a Pci slot blower.

I was thinking though of adding a small 40mm fan to blow directly over the mosfets under the psu to keep the PWM temps down, not overly concerned re noise tbh. Has anyone tried this ? How did you attach the fan ?

Many Thanks