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Timbren SES Helper Spring Kit Stock Height Rear - Rubber - GM Fullsize Truck 2001-10 204007 Look of a Manual 4-speedProduct Description: Helper Spring Kit SES Stock Height Hardware Included Rear Rubber Black GM Fullsize Truck 1999 2010 Timbren was founded in 1965 to advance the ride quality of trucks while towing. Today they manufacture suspension enhancement systems for towing, rubber helper springs, and full trailer suspensions designed for both on and off road uses.