Serpentine belt on my 5.7 needs replaced, the Merc # on the current belt has been superceded once maybe twice that I can tell and from what I can track down the latest # comes in at roughly 75$....I went to local O'reilly's and match it up with a Gates belt for 25$. I cannot think of any reason why something like a belt would need to be 'marine' but just wanted to see if Im missing something. My gut is telling me just put the gates on.... agree/disagree?