Opps,my bad,I thought most came with 3 fans 
Is this close to it ??
http://www.aliexpress.com/item/PC-VGA-Card-Mini-Heatsink-Cooler-Cooling-Fan-36-mm-2-Pin-Equilateral-Triangle-Free-Shipping/489961987.html
It's all I can find for now,I'll keep looking
The HS/fan seems to be glued or is stuck on with some really good stuff.
Shouldn't have to remove the whole HS/fan,just unscrew the 3 screws & swap it.
Is this close to it ??
http://www.aliexpress.com/item/PC-VGA-Card-Mini-Heatsink-Cooler-Cooling-Fan-36-mm-2-Pin-Equilateral-Triangle-Free-Shipping/489961987.html
It's all I can find for now,I'll keep looking
The HS/fan seems to be glued or is stuck on with some really good stuff.
Shouldn't have to remove the whole HS/fan,just unscrew the 3 screws & swap it.
If anyone has a need for replacement fans - either top or bottom. Please write office@butterflylabs.com and ask. We'll be happy to send them out free of charge.