Size of allen screw to mount IRFP044 to heatsink?

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I should probably ask this in the "Construction Tips" section... but what the heck.

For my aleph-x, time to get my hands dirty....
I'd like to mount the mosfets (IRFP044) to the heatsink with the allen screws (tapped), like many of you guys do. What is the correct diameter size of the screws to do this? M2.5, M3, M5?
 
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