I had these on a 2003 YZ125 with the newer KYB SSS forks. The top clamp is a OEM 2004 YZ125 56mm diameter and the lower is a OEM 2003 YZ125 that was machined out to 59mm. It has a new lower steering stem bearing with race installed. Will need the top bearing. This set up may work with other years but please do your own research.