Amazon.com: HP 644758-001 PCI fan assembly - 80mm (3.1 inch) x 80mm (3.1 inch) x 38mm (1.5 inch) with blue locking latch and cable - Mounts in front of the PCI card slots : Everything Else
PCI Slot Cooler Triple 80mm Fan PC Graphics Card Cooling 3500rpm 12V Power Slim | eBay
System Fan Card with Dual 70mm Adjustable UV LED Fans - Vantec Thermal Technologies (VantecUSA)
1 Set Dual Fan Mount Rack Pci Slot Bracket For Video Card 3x 8cm / 9cm Fan - Fans & Cooling - AliExpress