Part No. starting with R require rear sprocket replacement. Use sprocket bolt pattern 5-holes M10 PCD 100mm ID
76mm. Except for Part No. RA70600715, R70600B715 and RA70600515 that use oem sprocket, and Part No. RA70550757,
RA70600757, R70600B757, RA70600557, RA70550756, RA70600760, RA70600749, R70600749, RA70600549, RA70600755,
R70600B755, R70600B760, RA70600560 and RA70550760 that use oem pulley.