[72911]

I am replacing all of the AC parts on my 72 and found a used dual pulley. It has a smaller diameter than the original single pulley. I was wondering if this was normal for all dual pulleys (AC pulleys). I'm not too concerned because the smaller diameter allows the fan to turn faster which can't be bad on an AC car. The timing marks are the same except for the 15 degree mark. Anyone have a belt size they want to share for this smaller pulley? Also maybe someone has a belt size that would go to the AC compressor? If my math is right it is just about 10% smaller.