Headset Bearings: CP-HP49 P08H7.5 MR155 TH-870DJ : ID 30.5mm, OD 41.8mm, H 8mm, 45°/45° angle CP-HP50 P08H8K : ID 30.5mm, OD 41.8mm, H 8mm, 36°/45° angle CP-HP51 P03 : ID 30.15mm, OD 41.0mm, H 6.5mm, 45°/45° angle CP-HP52 P08 MR121 : ID 30.15mm, OD 41.8mm, H 6.5mm, 45°/45° angle CP-HP53 P08H8 : ID 30.5mm, OD 41.8mm, H 8mm, 45°/45° angle CP-HP54 P09 : ID 27.15mm, OD 38mm, H 6.3mm, 45°/45° angle CP-HP55 P16 : ID 40mm, OD 52mm, H 7mm, 45°/45° angle CP-HP56 P16H6 : ID 40mm, OD 52mm, H 8mm, 45°/45° angle CP-HP57 P22 MR168 : ID 34.1mm, OD 46.9mm, H 7mm, 45°/45° angle CP-HP58 P18H8 : ID 40mm, OD 51.8mm, H 8mm, 45°/45° angle CP-HP59 P19 / P21 : ID 37mm, OD 49mm, H 7mm, 45°/45° angle CP-HP60 Lefty : ID 39.7mm, OD 50.8mm, H 7.14mm CP-HP72 ACB518K MH-P518K  : ID 40mm, OD 51.8mm, H 8mm, 36°/45° angle