Battery mounts just below the secondary clutch. There are two pre-drilled holes in the belly pan for the battery holder bracket.
You will need to drill out a couple of rivets at the bottom of the left steering hoop to install the aft end of battery holder bracket.
Holes are pre-drilled in the bulkhead fot the starter motor.
The pinion bracket attaches to a couple of holes just below the Y-pipe, (can be a bugger to get to).
Wires plug into the harness at the aft end of the clutch/electronics cover.
Hope this helps,
Ken