Manufacturer: American Standard Tank P/N: 4192A Rough-In: 12" Tank Only, does not include lid or internal parts. Internal parts and Lid 3-742 / 735184 Can be purchased separately Note that this tank uses the lid 3-742, which is also used on Crane 3742 tanks. However, the tanks are not interchangable. This tank has a 6.5" bolt spread, and the Crane 3742 tank has a 5.5" bolt spread. If you are identifying this tank by the number on your tank lid make sure to carefully measure from center to center of the bolt holes to avoid costly return shipping if you order the incorrect one.