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Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
The 9/16 & 11/16 is referencing the bore of the cylinder. Amazing it takes 9/16" for one disc yet just a mere additional 2/16" to handle dual disc. Doesn't make sense to me at all.
Even though the piston is only 2/16 larger in diameter it has nearly 150% of the surface area therefore it will apply 1.5 times the force as compared to the 9/16 piston.