American Standard 2002 Color:Regency Blue Lid P/N: 735003

Lid P/N: 735003

but this one is extremely rare

The lid is designed to accommodate tank internal parts that stick up as much as 0

If your tank is 21" it is this item

Simply take a piece of cardboard and place it on top of the tank

American Standard 2002 Color:Regency Blue Lid P/N: 735003Manufacturer: AMERICAN STANDARD Lid P N: 2002 or 2003 Lid Size: 21. 125" x 10. 25" Tank P N: Tank Size: 20. 25" x 9. 5" Note: This lid may be marked 2002 or 2003. They are interchangable. However, there is a very rare extra tall version of this lid. Specify the height of your lid during checkout in the comments so that we can ship you the correct one.