there's no confusion mate 🙂
its just that on vx220.org there amendment that the 100amp alternator is the only one that fits with the supercharger
im saying thats not the case and the 100amp and the 120amp are of the same dimensions i have both here
i bought the 100amp for the same reason as you then found there both the same size so fitted the 120amp instead
you can make modifications to the rear cover and fit the alternator or just remove the cover and then fit a suppressor (the cover has a suppressor built in)
the 2 posts with pictures are proof enough that it can be done 🙂
just saying 🙂
another tip don't cut your fuel pipes when fitting the charger its a bad thing to do with 4.5bar in the fuel line 🙂