I've seen that cover advertised somewhere else before and it says it will fit a 4 seat RZR. If it doesn't Amazon is great with returns.
Another one I was looking at was a buggiebag.com they are super stretchy and will fit over pretty much any accessory but they are $189 and I don't think it will fit all the way to the ground, might have to get the sandrail one that is $225 to cover the tires also.
I bought the Polaris cover for the RZR 4-1000 for my 900 any love it. Was the best investment I made. We are on a lake and when the wind blows it blows. Fits like a glove, well made, and protects it good. Spend the money and get a good one.
Not sure where you live but check an awning cover shop. There is one in town and they make covers for big jet boats in any color you want, custom to the boat - between 250 and 400 is what I've seen.
I was not aware that Polaris had a cover that would fit the 900 4 seater. I don't mind spending the money , I was running out of options and time to get a cover over the machine for the winter . Would the Polaris Cover survive a CO mountain winter ?
I left CO and my brother leaves on the 15th. He will cover it for me.
Not sure I have time to get another cover there in time. Overnight deliveries can take a week !