Sorry, I don't have one or have any leads on one. If nobody sees your ad and sells you one, then you could find out the size (by contacting Horizon or asking in one of the other forums here on RCU). I imagine it is a standard size, and could be found at many places that sell raw material tubing. If I bent or lost a wing tube, I would try the latter route before ordering an OEM replacement, as a raw material one would likely be less expensive.