If the side sit flush against the chamfer it is 45°. If the chamfer is steeper than the sides it is a 36°. Alternatively the old bearings can be removed and cleaned up. Finally check both the internal and external angles.
Replacement Bike Headset Bearing Angular Contact MTB/Road Hope FSA Acros
OTOTEC 2pcs Bike Headset Bearing Lower 36° x 45° MTB ACB Bearing Replacement Part MR127 Compatible with FSA Orbit No.57 TH-073 Headset Bearing Sealed Bearings Accessory
ZYNCUE Bike Headset Bearing with Ball Bearing Steel and Rubber Dust Cover Tapered Design 40x52x6 5mm Replacement for Bicycle Headset Accessories
EXTRWORY Bike Headset Bearing 41.8x30.5x8mm Ball Bearing Steels Rubber Sealing Cover 45 Degree Taper for Road Mountain Cycling Replacement Silver 2Pcs
Qualoramall Mountain Bike Headset Bearing 39/41.8x30mm for Straight 1-1/8 Inch Fork Silver Bearing Steel Replacement Part(39MM*30.15MM)
Bike Headset Bearing, 52x40x6.5mm Tapered Ball Bearing Steels with Rubber Sealing Cover, Low Noise Smooth Rotation for Cycling Replacement
