I recently pieced together a supercharger setup as well as bought a used V2 Headunit from a guy on a mustang classified site. However this is my question, when purchasing a headunit is the 3.60" pulley suppose to be present on the rear of the headunit behind the large bolt? Im asking because I haven't heard anything about having to purchase one on all the write ups I've looked through. Did the person I purchase this from simply not include it? This is the only thing holding me back from finishing my install. Thanks in advance.