I had a little free time this afternoon so I mocked up the split bench to see what it will take to install them. Here are some pics as requested...
The seat bottom hinges require four bolts. No holes exist but they will be easy to drill. The pair of bolts was for the solid bench hinge.
With the seat flipped forward, you can see the other two bottom hinge brackets, and the latch catch.
I will be able to utilize one of the seat belt holes (the split bench has integrated belts) but I will need to drill for the other.
I also got my summer tires/wheels mounted this week - 255/85-16 BFG MT's on 16x6 steelies.