PC Fan Rubber Mounts - Noise Reducing Silicone Anti-Vibration Screws for Computer Cooling, CPU, Case Fans - 60 PCS. A fan needs 4 screws, and 20 screws can fix 5 fans. Easy To Install: No need for a screwdriver, just put the silicone screw through the fan screw hole, pull it hard by hand, pass the silicone screw through the fan and the pc case and fix it.
eBay