https://militarytires.ca/product/9-0...superlug-tire/
They do not list tubes or flaps for the above tire. When I have done the ferret RF tires in the past, I went with a much smaller tube due to the thickness of the tire. You do not need a 9.00-16 tube in a ferret tire. If you did use a tube of that size, I would expect the tube to fold over itself which would result in the tube chaffing and eventually blowing. Go to something smaller like a good heavy duty 7.50-16 or even a 7.00-16 tube. You can use just about any 16" re-enforced flap. In the past, I always recommended the Doberman brand tubes and flaps. They have the valve on center tubes which are harder to find these days, and their flaps have good re-enforcement at the valve stem so the tube doesn't blow thru the slot. That was the brand Wallace Wade used to sell at all the MVPA conventions.