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Hey guys here asking for a bit of help. I have a 2003 Centurion Avalanche. The previous owner put a fiberglass swim deck on the boat. Which seems to mount on top of the original. Can anyone help with finding a replacement? It’s def seen better days. Any help would be much appreciated. Thank you in advance I tried posting a picture...but it says it to big.  

Thank you very much guys. I appreciate all of you. What ended up happening is when the boat was last serviced they switched the idler pulley and the tensioner pulley locations so there wasn't proper tension on the belt. 

Thank you very much for all your help. I really appreciate the input. It took forever for me to figure it out. But now we are up and ready to go :))

hello new to the forum so forgive me in advance

 i have a 2002 centurion hurricane with the 350 Mag MPI Tow Sports s/n OM310293. yesterday on the water the serpentine belt slipped off, i was able to salvage part of the belt to get back to the dock thank goodness. at first i thought the idler pulley must have a bad bearing, so went home to order parts and this is where the trouble started. when i look up parts for the serpentine belt and a replacement pulley i get conflicting part numbers. (807757T idler pulley 3" diameter) or (864625T idler pulley 4.25") same with the serpentine belt i get (8638765 serpentine belt 87.5") and (807755 serpentine belt 88")

what puzzles me is the sizes... is it universal because of the idler pulley bracket has an adjustment? 

i called a local shop and when they look it up same thing... please help id like to get back out on the water :))))