PLEASE READ ALL OF THE FOLLOWING CAREFULLY: The only PowerTwist belt needed on the Super 7 and ML7R is an "A" section from the countershaft to the headstock. The use of this belt guarantees that the lowest speed will be available as, when fitted with the metal-pin NuT-link there may not be enough room between the inner face of the headstock and the largest pulley on the main spindle.
From the MOTOR to COUNTERSHAFT, choose a "Z" section T-Link belt as available here.