Magnetti Marelli IAW 5AM ecu ground point

[booger]

On the IAW 5AM Magnetti Marelli ECUs, is the ground point the threaded hole between the two mounting holes, or is one supposed to attach the ground through one of the mounting holes as they are the same diameter but not threaded. Reason I'm asking is I removed the ECU a couple of months ago and I recall the ground wire was attached to one of the bolts that goes through the mounts, not to the threaded hole in the heatsink. Is that not what the threaded hole is for?

EDIT: Ahh, nevermind. Has to go through one of the bolts.