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For what combination of fans? If you are going to simply repurpose your stock fans, you can re-use the case screws to mount the base to the gantry, use two screws from the 4010 fan to remount the 4010 fan to the cooling duct, and use the other two screws to mount the cooing duct to the base. If you have one of the newer Hero Me Gen2 bases, you will need two M3 x 8mm screws to mount the cooling duct to the base, the screws will self tap into the base holes, no nuts are needed on the backside these screws.