The same as the RoHo Jetstream Pro.
Carbon Fiber Backrest - 15" wide, standard 16" height w/ adjustable
angle & seat depth mounting hardware, paid 560.00$US.

I am in Montreal, Canada.

Webpage of the product:

I used it for about a month, just not for me. Like new, pics of mine available to those interested. Pics from their website:

PM me if interested. Will sell to the best reasonable offer (Paypal prefered), if no one is interested here I guess it will go on eBay with a price reserve.

Thank you.