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Carnation

Sill Gasket

Sill Gasket 

Owens Corning Foam SealR 1/4 in. x 7-1/2 in. x 50 ft. Sill Plate Gasket

It needs to be the version that is 7.5" wide. 

http://www.homedepot.com/p/Owens-Corning-Foamular-1-4-in-x-7-1-2-in-x-50-ft-Foam-Seal-R-3FS/202274536

It needs to be shipped to your local store, but that only works for some stores.