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Hey all-
My local NAPA shop just sold me an 080537 belt for my 4b3.9-M (sn 44142600). The counted guy couldn't find it in his book, so he did a best visual match.

Is this the right belt? Thanks.
 

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Depending on your engine options, configuration, etc. there is no one size belt used on the 4bt. But there is a pretty narrow selection and a 8 rib, 53" belt is in the ballpark. The number you listed is 8 rib and 53.7" long, well within the ballpark. Take it home and see if it fits. Due to limited throw of the tensioner on my engine I need to slip the belt onto a smooth pulley last. If I try to install it on a ribbed pulley last it is too short and the next size larger belt is too big.
 
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