Just spoke to 'young' Chris and all is good. The bottom mounting point reuses the stock nut that is removed to secure the tank. The top mounting point uses a new screw that holds the tank down. I'd say the fitment is pretty much perfect and there is about 10mm of room to adjust it. Unfortunately the holes that need to be drilled won't match up with the scratches so will need to invest in a Sharpie pen.
Now I need to work out how to get this battery out so I can secure my pump
Before anyone asks, the pump isn't hooked up. I just put it in there to see if there is enough clearance.