No, it wasn't.
Funny thing about this. The two bolt holes on the side of the engine, match the holes on the regulator. But, the ONLY way to get it to fit flush on the engine, is the turn the fins towards the ending, and put spacers between the regulators tabs and the engine. If the fins are turned outwards, the connector itself keeps it from sitting flush.
The regulator I looked up for this engine, only has one hole. I can see a nut factory welded to the back of the plate a regulator mounts to. But I didn't check to see if there were two.