New Replacement Stirrup Yokes for the Bose X. Now you can repair your Bose X Headset with broken stirrups, easy to replace. These new Stirrups are an aftermarket exact replacement for the Bose X stirrup. It is made out of an Carbon type Resinc and is light black in color, very close to the Bose color. Bose has had a problem with their Stirrups since they were new..they get brittle with age and will crack for no reason. If you buy used original Bose stirrups they will crack and for sure if you buy one that has even a small crack. These won't crack ever, guaranteed! I have stirrups in stock ready to ship.