Manufacturer: KOHLER New Lid P/N: 1211811 Old Lid P/N: Lid Size: 17.5″ x 9.5″Tank P/N: 5380-CS5-AA or 5380-AA or 31126-CS-AA Tank Size:16.75″ x 9.25″ Toilet Model: Elliston K-12767
Note: Kohler makes another tank lid that looks just like this, 1446014. It fits a tank that is 16.75″ x 8.75″. To make things extra complicated, sometimes they stamp the tank 5380 and the lid 1211811 but it is actually a 1446014. The only way to tell for sure is to measure your tank front to back, and order based on the measurement.
