A replacement KOYO taper roller bearing for the upper headstock.
| Fitment | |
| GPZ 600R - all models | Upper Headstock |
| GPZ 750R - all models | Upper Headstock |
| GPZ 900R - all models | Upper Headstock |
| GPZ 1000RX - all models | Upper Headstock |
| GPZ 1100S - all models | Upper Headstock |