QR Code Link to This Post This is a used Condor universal E track adapter. This mounts to two strips of etrack and then you mount your Condor chock to it. It will hold any Condor chock. There are 3 "tabs" that you bolt to your condor. The end mounts are a bit flexible so you don't have to have perfectly aligned track to have it work. It goes down to 29 inches on center (to the track) and expands to 46 inches (while still "together" well). It is used and there is some wear but functions well. There is no boomerang bar included. While I have not used this system (did not fit my small trailer) I think you will be fine without it (or you could buy or make one). I do have a few of them if you wanted more than one.