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Does anyone know what the difference is between a BB long water pump pulley P/N 3932402-UD and 3932402-DU? I'm seeing both on eBay but no specifics. I need a correct water pump pulley to go with my 3955290 crank pulley and my 3770509 power steering pulley on a 396.
 

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Could one be an error or a typo? Are these deep groove pulleys from a certain model year? I used to have the numbers for my '69 deep groove pulleys written down but.....
 

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