FSA Orbit NO.42/ACB-A 1-1/8" Upper & 1.5" Lower Tapered Integrated Headset

Cone race 39.8mm. Upper bearing OD 41.8mm. For upper 46mm OD, lower 56mm OD head tube. 1-1/8", 45°x45° upper bearing. With 7mm height alloy cone spacer. Lower bearing OD 51.8mm. 1.5", 36°x45° lower bearing.

eBay