Manufacturer: GERBER
Part Number: 28-199
Lid Size: 18.75 x 6.75
Tank P/N: 28-195, 28-495
Tank Size: 18.25 x 6.5
For the 10 Rough-In version of the Gerber Maxwell toilet. This is a fairly rare lid and it is much more likely that you need the standard Gerber 28-499 for 12 rough-in toilets.