8 x 40mm heatsinks each with their own 12 volt 40mm fan originally destined for the hot end f a 3D printer. After fitting the heatsinks I do see some possible trouble connecting the DC power wires and the 220v ground tether after being assembled. O it looks like I will stop here for tonight and get the connections for the tether soldered up so I can make these connections before I put the antenna gimbal back on. Oh and I didn’t mention it , but removing the antenna gimbal is a must to get to these fans and the screw connections as well. There is one set on each side as one psi board is mounted in the opposite direction for the purpose of keeping the load balanced as much as possible on the frame.