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 measure the diameter of their Mach 1 balancer I'd really appreciate it. Thanks!