Need input on belt size

SVTvsTheWorld

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Jan 23, 2018
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Location
Corpus Christi, Texas
My 03 Cobra currently has a 2.85 pulley on it. I just got a 100mm aux idler, and 3 90mm replacement pulleys (dual bearing). I plan to install tomorrow. Do I need a new belt? If so what length? I've looked at the belt charts online but I'm not really sure what i need.
 

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