Kinetic Headset Bearing ACB3636150S Stainless Steel AKA: ACB6808SS

From Kinetic:

• Inner x Outer x Depth (mm): 40 x 51 x 6.5
• Inch Dia: 1-1/2"
• Angle / Chamfer (Deg): 36 / 36
• Bearing ID: 40mm
• Bearing OD: 51mm
• Bearing Thickness: 6.5mm
• Internal Angle: 36 Degrees
• External Angle: 36 Degrees
• Material: Stainless Steel
• Grease: Mobil XHP-222 or SINOPEC HTHS Bearing Grease
• Seal: Double-sealed 2RS
• Used On: Trek Madone /Domane (Lower Cup)
• Equivalent Part Ref: ACB4051K-SS, MR006