If I remember correctly pulleys aren't flat and the bolt holes have bosses that fit into the balancer??? I wouldn't use aluminum in an area like that it has a tendancy to work harden get brittle and fall apart. I would use steel washers under each if I could not find correct pulley. just my .02
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1969 C10 350 3spd
1995 GMC 3500 XC 350 dually
When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin
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