ACB518H8 Road Bike Headset Bearings 40*51.8*8 mm 45/45 Degree Chrome Steel Tapered Upper Lower ACB Bearing Set
https://www.vogueparade.com/shopping/EN/200001385/1/1005003717636930/acb518h8-road-bike-headset-bearings-405188-mm-4545-degree-chrome-steel-tapered-upper-lower-acb-bearing-set//