I do have them, and have since they were only available on AE's site. What is frustrating about them is, the ballstud seems to come loose on tracks that seem to have a lot more turns one way than the other. The little aluminum lock nut vibrates loose and the ballstud starts moving around and that's no good. Would like to find some tiny lock washers and use the tiny flat nuts from AE with a drop of loctite to see if both sides will stay tight. Any idea's?