The defogger switch for the 1964 sits in a 1 in. x 1.5 in. opening in the dash. This opening is below the windshield wiper control knob. The switch is moved up or down to activate vs. the rotating switch used in later models. The first two pictures below show two rectangular switches for the '64, and one switch used after '65.
I also included a couple of pictures of the defogger. Note the difference in the motor housings for the '64 (two pictured) and the housing used in later models. The wire connector is different for the '64, as it pushes onto a brass pin on the motor housing.
The Defogging Blower Gasket (Part No. 9776181 shown with tape measure - gasket in background is for a later model) measures 1/2 in. thick, and is made of high density foam rubber. Surprisingly, for all of the years this sat in the back window, the gasket is still rather supple.
Hope this helps.
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