I bought the Hard Cab Rear Bulk Head from Diesel Freak. The lower half is metal, the upper half is Glass.
Great visibility, I really like mine. NOTE: Listed as Sold Out
Diesel Freak does list an OTR Bulk Head for $1,000.
The Polaris Ranger rear soft windows fit perfectly in the Roxor rops. I bought one of these and velcro'd a piece of 1" thick black closed cell foam insulation to the bottom that I also zip tied to the bar. Works perfect to keep the wind off in cold weather, and easy to remove in the summer. I've also got less than $60 invested in the whole deal.