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4 bolts going into the seat and 4 into the floor or 4 through the seat and into the floor. use fender washers for the seat and baking plates under the floor.
I was thinking 2 side mounts on the front bottom and 2 brackets attached to the tabs welded to the roll bar bolted to the top back of the seat. I'm just brainstorming at this point, final fitment will be being done by a friend who has experience mounting seats.