Components TU014 Chrome base. May be used in place of polyurethane base. TU021 Slide. TU016 TU009 TU027 May be added to B1002 only - not applicable to any other models. Allows seat depth to be adjusted. ©1999-2003 BOSS CHAIR, Inc. All rights reserved worldwide. 5353 Jillson Street, Commerce, CA 90040, Tel:(323) 262-1919 Fax:(323) 262-2300