I just used the v belt variant. Pretty primitive adapter bracket that took about half an hour to make. It's just 2 standard bottom bolts with tube over them to take up the difference.
Not at home at the moment, but I'll try and remember to take you some pics in the next few days.
100a would probably be more than enough if you're not running all the electronic shit I have. Just my coils could (but probably never would) pull 40a.