I measured the distance around the alt and crank pulley with a tailor's tape measure...i have an aem pulley on my alt and my length was 39". I do have a 4th gen, not sure if any different, i'd assume not.
Pretty much what MNludeDVR said, measure around all the pulleys for the belt in question, and take that measurement to a parts store. They should be able to find a belt that will work
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