It's easy enough to fab your own brackets... and they will probably be stouter than Procharger's anyways.
I don't think ATI makes a PS-side bracket.
As long as you aren't turning the blower around you would be able to use a standard rotation model.
There are a couple of considerations to putting the supercharger on the passenger side. One, you'll have to place the tensioner on the "slack" side of the belt, which on a PS-side installation will be the bottom of the belt. Two, the exducer housing / air outlet will also be pointed in a direction that won't be as conducive to a blowthrough carb setup as the driver's side mount is-- i.e. with the air outlet on top, it will be pointed towards the passenger side fender. If you spin it around to point up and towards the carb, it may interfere with the head/valvecover and require you to push the supercharger forward more, which isn't a good idea when it comes to stress on the crank snout.
You'll probably be on your own for a crank pulley as well, as AFAIK Procharger does not make short waterpump crank pulleys. Just remember to keep the SC belt as close to the crank as you can to minimize stress on the crank snout.