Here's a shot of our new, GT style of the 50/50.
You may be able to find a used one in the standard headrest style without large openings. The only problem with the small slots is if you have harnesses. You'll either have to undo your belts when you want to get the seats out or get clip-ins.
Not sure what your height has to do with a bench though. The owner here is 6'2" and fits in any of our bucket seats. If it's the height of the sides he was referring to, check out the RS:
RS Suspension Seat for Polaris RZR | PRP Seats
It has lower sides which really help with getting in and out of your RZR easier. It's a newer seat so you may not find any used.
I have a couple of pairs here of the original prototype I can probably get you. All the same great quality, of course, the final pattern just came out slightly different and these have been used as displays. They're black ostrich with black suede center stripes.
-JD