This cooler was designed specifically for the unreleased AMD Pro V540. It may work with other GPUs as well. This design for the v540 respects the intended airflow direction and allows for even cooling of the dual GPUs.

I went back to a tube axial fan so that we can still mount the fan on the rear of the GPU but get the right airflow direction. It is spec'ed to work with motherboard headers to simplify running the fans. The temps are okay with this cooler. Nothing is going to overheat but you will be running than fan at 100% if you get it under 100% load. If you are not heavily loading the GPU you can get away with much lower percentages. This is the largest fan I can fit if the GPUs are to be able to fit side by side on a standard motherboard.

Sadly, this design also requires some additional hardware meaning you will need 2 M3x35mm screws. These can be sourced from McMaster Carr, Amazon, or your local hardware store most likely. As for interfacing with a motherboard you will need to crimp the contacts onto the leads! I took my time and crimped the contacts with my Leatherman and it really wasn't bad. This is a PWM fan so it is 4 wire making speed control simple if you go this route.

Here is the shopping list:
1x 3D printed manifold - Files attached! Figure it out :)
1x Fan - https://www.digikey.com/en/products/detail/molex/0008500160/3071500?s=N4IgTCBcDaIOoFkCMA2ArEg7AWgHIBEQBdAXyA
4x Contacts - https://www.digikey.com/en/products/detail/molex/0008500160/3071500?s=N4IgTCBcDaIOoFkCMA2ArEg7AWgHIBEQBdAXyA
1x Connector Housing - https://www.digikey.com/en/products/detail/molex/0470541000/2405319?s=N4IgTCBcDaIOoFkDMYAcBWAtAOQCIgF0BfIA
2x M3x35MM Socket Head Cap Screw - https://www.mcmaster.com/91290A135/

NOTE: When printed depending on the printer the holes for the screws may need to be drilled out to final size. Tapping is not required if you get it right. 7/64 bit seemed to work best for me.