If it seems that your Mustang rear quarter windows are sagging a little and need help to raise and lower you may need to replace your window motors. Don't feel bad, it is common for these Mustang 1/4 window motors to fail over time. Replace your Mustang convertible quarter window motor today! Plus, now we have our new 83-93 Mustang Convertible Quarter Window Guide Rod Mounts to fix sloppy 1/4 windows!