Crank Pulley posted by GotTwins90 on April 10, 2013 at 08:03 PM
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could tell the origin from the shipping box, maybe with some research on your part. An OD water pump pulley is not "a must", but it's highly recommended. I used a UD crank pulley without one for a year in AZ without issues, but then bought one just to be safe. All belts will be different.