Kinetic Bearings Headset Bearing ACB37489H6.5K BO, Cervelo Fit (same as MR031)

From Kinetic Bearings:

Part Number chaged from ACB49H6.5K, and now called ACB37489H6.5K-BO
BO= Black Oxide (corrosion resistant coating)

FITS CERVELO ROAD BIKES - LOWER BEARING
& TREK MADONE UPPER BEARING (Trek Part W513538)

ALSO KNOWN AS: ACB49H6.5K, MR031, 160-6753, IS-2-138, ACB6806CC, HD 1446 K

Inner x Outer x Depth (mm): 37 x 48.9 x 6.5
Inch Dia: 1-3/8”
Angle / Chamfer (Deg): 36 / 45