Park Tool 106 Accessory Collar Want to add some more functionality to your Park repair stand? Grab a Park Tool 106-AC Accessory Collar. It easily adapts the #106 Work Tray or PTH-1 Paper Towel Holder to fit 35mm-37mm upright tubes on PCS-9 Repair Stands, as well as 2003 and newer PCS-1, PCS-4, PCS-4-1, PCS-4-2 Repair Stands. Features Increases storage and functionality of you Park repair stand Manufacturer's Part No: 106-AC UPC: 763477012227 | Park Tool | 106 Accessory Collar 1 3/8"; Fits Pcs-1, Pcs-4 And Pcs-9