The early ones had a three piece bearing, cup, race and cone, on each side of the wheel. They became difficult to find many years ago. May be worth trying Jon Cruse at the Hailsham Mower Centre. The later ones had a pressed in capsule one piece bearing on each side of the wheel. The later ones were used in the front wheels of the Harrier 48 etc and as far as I know are still available as a Hayter spare. I seem to remember that they were ā impossibleā to match with a pattern part but things may have changed. You can still buy the complete wheel and bearing assembly as an original Hayter part ; last time I did so, about Ā£10 a corner. Central Spares do?/ did? A ānear asā wheel assembly at around the same price – may still do.