PITCH is the distance between the center-line of 2 adjacent belt teeth
Harley Davidson was always the supplier of Buell drive belts best of my knowledge. HD switched suppliers from Gates to Goodyear for all Buell drive belts around beginning of 2004 model year. Goodyear drive belt is Hibrex aramid construction and purportedly vastly improved over Gates belt.
Purchase part # G0500.1AKF and be done with it.