Here is the cooling solution I used for the VSA chips. Not cheap, and perhaps overkill, but it's what I wanted.
Heatsinks are Enzotech Northbridge coolers, and they fit the mounting holes on the V5 PCB without modification
For fans, I used these Noctua 5V 40mm fans. I was only able to screw down to the heatsink on a single corner, due to the slight size mismatch, but they stay put just fine.
It was necessary to change the connector on the end of the fan cable, as the Noctua connector was bigger than the connector the V5 uses.
And also some generic ram heat sinks