For use with cadet 3 two piece toilets with standard 12 Inch rough tanks, models 2386, 2383, 2384 From the Manufacturer American Standard Cadet-3 Tank Cover for 4021, White no.735121-400.020 About American Standard Brands Great performance and great looks meet in our complete line of fixtures and faucets for bath and kitchen. Performance and reliability. Coordinated collections. Ingenious features. American Standard is Style that Works Better everyday. Item Length: 24 inches, Width: 12.625 inches and Height: 4.875 inches. This tank cover is designed to only fit the model specified.