Models 740 to 749: The Cosco Step Stool and Chair, 1940 Cassie Wood October 01, 2024 14:21 Updated Related articles Replacement Treads for the 11120 Retro Step Stool Models 140 to 149: The Cosco Set-Up Stool, 1940 1960's Stools and Chairs Are replacement treads available for my vintage Cosco product? Requesting Replacement Parts