Whats the difference in Ac crank pulleys and ac harmonic balancers?

Hey I own a 1964 Imperial that came with heat only and I'm converting it over to an ac car.

What's the difference between Imperial crankshaft pulleys throughout the years? Does the harmonic balancer also have a specific ac type over the heat only ones?

I was looking into redoing my harmonic balancer (as mine is shot) and it mentioned that the ac crank pulley could be rebuild also.

Does some of the the pulleys have rubber in it? Or a special rubber mount?

I already purchased a 4 slot...

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Author: 64Imperial