From RockAuto.com... states different sizes.
Help would be much appreciated!
Also, best place to get one? (cheapest, but not cheapest quality)

I bought this one: GOODYEAR Part # 4060875 6 Ribs / Effective Length 87.5" / Outside Length 88.25" Poly-V. It's a Gatorback belt and it's quiet and is a very high quality belt. Don't forget, if you're replacing the serpentine, you also need to replace your tensioner assembly: GOODYEAR Part # 49246 Belt Tensioner Assembly Poly-V. These are the parts I purchased for my Jeep and after 20,000+ miles, everything is still good. I would recommend you buy from Rock Auto as they have some of the lowest (if not the lowest) prices around. Good luck!

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2003 Renegade 4X4 5-Speed, Bright Silver *TRADED for 2013 Wrangler*
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Garmin GPSMAP 76S
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