Manufacturer: BRIGGS
Lid P/N: 7421
Lid Size: 20.25 x 8.75
Tank P/N: 4425 & 4426 & 4428 & 4920 & 4928 & 4930 & 4950 & 4730 & 4718 & 5930
Tank Size: 19 x 7.75

There are many variations of the 7421 tank lid, including but not limited to Briggs 7421-R, 7421-2R, 7421 A IIB, Briggs-R 7421, etc. They are interchangeable. There were manufacturing changes over the life of the product but the lid bottoms will work from one tank to another.