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  1. 2003 - 2004 Mach 1 Mustang
    I'm in the middle of my Vortech supercharger install and not sure what size belt I'm going to need. I've got a 2003 Mach 1 engine in my GT with the stock 99 GT harmonic balancer. Does anybody know what belt I'll need if I use the 99 GT piece? The diameter on mine is about 5". If somebody can...
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