Toto ST454 5 Tab Version Reproduction Color:Cotton White This is the smaller of

This is the smaller of the 2 versions of this tank

Tank Size:  16

Tank P/N: F78275-CS-AA or K78274

Lid Bottom Maximum Dimensions: 15

Lid P/N: 151-0777

Toto ST454 5 Tab Version Reproduction Color:Cotton White This is the smaller ofManufacturer: TOTOLid P N: ST454 (version with 5 tabs on the underside of the tank lidLid Size: 16. 375" x 8. 25"Toilet Name: Drake IITank P N: ST454Tank Size: 16. 375" x 8. 25" This tank lid has been revised by Toto. There are two versions. You can identify the differences either by counting the number of tabs on the underside of your lid (5 vs 9) or by measuring. The difference is only 1 8" in both directions so it is important to measure accurately.