When upgrading your 8- or 10-rib drive systems, Innovators West drive pulley idler shafts or stands are required for the proper positioning of the smooth idler in place of the factory idler. These shafts or stands are included with the Innovators 8- and 10-rib conversions and are also offered individually as replacements. Maintain the performance of your drive pulleys with components from Innovators West.