If you quarter windows are loose, falling down or won't go up or down like they should then this may be your problem. This is a replacement roller that goes on the bottom of the quarter window for many GM cars from the 60's on up, it is a direct replacement for your broken part. This item has not been available until recently, we have added CNC equipment to our shop so we can make many of the parts that were not available before. This roller has the proper length shaft so you won't be stuck using the wrong parts, we also have available a complete kit with the metal and plastic washers and nuts. They are sold each and you will need 1 for each window.