I had to find the correct crank pulleys to convert my '66 vert to AC. I pulled them from a parts car and it had the rubber ring sandwiched between the two crank pulleys as shown in the pics. It was not just a '67 thing and I agree with "grrowl" who posted previously that they go back at least to the '64 set-ups.
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1966 Bonneville Convertible, 421, 4spd. (in progress) 
1966 Bonneville 4 Dr. Hdtp. (survivor) 
1999 Trans Am Hatchback, red, 6 spd. 
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