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Yep..38504 is the napa number for the tensioner and the belt is 080537. Napa rocks.
I think that belt number should read: 25080537 (Can also be shown as 25-080537.)

It's the number the cummins belt crossed over to in NBH, and it's the one I got and installed on mine.. The NAPA on Magnolia (not the warehouse) had 3 of 'em in stock.
 

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Discussion Starter #22
You're probably right. That was the number I saw on the packaging.
 
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