I used the same exact product as I did with the 250 Rally. I ended up mounting to the same spot too. It`s sort of tucked away, but easily accessible and visible.
The installation requires that you remove the left side panels to access the battery, but thats about it. Red to red and black to black and so on.
I did use a file to deepen the notch that was already there in order to route the wire a little better. There is actually quite a lot of room behind / above the tool box so I was able to mount the plug so thta it is sort of rectrabtable / tuckable.
Amazon has the plugs >>CTEK (56-382) Comfort Indicator Eyelet for M8 Top Post Batteries