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Note: 2000HD chairs have 5 screws per side to attach the seat upholstery; all other chairs use 4 per side.Note: Burgundy and Blue upholstery is no longer available and must be replaced with Black upholstery.Note: Prior to August 2010, chairs used M5 screws. Chairs now use M6 screws. All upholstery ships with M6 screws assembled to seat, and M5 screws included with back hardware.Note: As of August 2009 EC2000 Heavy Duty 26", 28" & 30" are obsolete; replacement seat and back upholstery in these sizes is obsolete; replacement parts are not available.Note: Back Upholstery has a chart pocket.