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According to what I reasarched, the belt length for the factory 92244381 belt(for a factory harmonic balaner) is 1108 mm or 43.6 inches. I really like continental belts but I have a choice of 43.5" or 43.8". Thoughts on which way should I go with it?
 

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4040438 is 43.8" while 4040435 is 43.5". A/C belt tensioner keeps the belt tight on the pulleys when it stretches due to both usage and age. .3 inches is about 7.62mm.
 

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Buy both. Put both on. Make sure the tensioner is applying full tension AND still has adequate travel. Keep the belt that allows this the best. Return the other.
 
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