I've started buying CF wing and stab tubes from vendors on EBay. They are very reasonably priced and arrive fairly quick for coming from China. I make my own sockets out of fiberglass. Quite easy to do. Take the wing tube and wrap with 1 1/2 to 2 wraps of 1mil plastic. Use tape on the ends of the plastic and keep it wrinkle free. Roll on a couple layers of 3oz cloth that has been wet out with laminating or finishing epoxy. Let dry and simply pull free from the wing tube. Perfect fit every time.