From what I have read no one is currently making them. However they are slated to resume production by this fall. So maybe we will see some by the time the big guy comes down the chimney this year.
Or you can fashion your own bar system for it and have a local upholstery shop make you one.
I stopped into best top a couple years ago, who I believe bought kayline (who made 800 tops), and they told be they still had the templates and would make them to order. I would give them a try. Again, my information is 5-6 years old...