Used Plywood Centerboard / Daggerboard Fits Sea Snark, Super Snark, Sea Skimmer, Sea Devil and Sunflower. 

29-1/2" overall length (25-3/4" to stop edge) x 8-5/8" wide.

Some sailers call it a centerboard or even a keel, but technically it is a dagger board because it slides up and down rather than being pivoted like a center board or fixed like a keel. Dagger Board for Super Snark, Sunflower. #62420.