Sorry for my slow reaction time.
I mounted my 3 point belts using the stock mounting points. Install time was around 1/2 an hour, for both sides, working slowly.
The belts I bought were absolutley identical to the XV belts, I just picked the other guys to avoid UPS. My only complaint, and it is minor, is that the buckle end of the belt (at the console) is a little short. I think maybe 2" longer would be more comfortable.