This is for a bike that has an Acros Ai41 upper headset cup and an Ai41 lower headset up, i.e for a straight `1 1/8 steerer fork.
You will receive
2 X MH-P03K Bearings
30.15x41x6.5 – 36/45
(Also know as MH-P03K / ACB337 / AC3041/ MR122)
Please not this kit does not come with the compression ring used on the modern version of the headset. You can reuse your current ring if still in good condition. Or you can buy these rings online. Please check your current headset to see the ring.
These bearings are not Acros branded. They are selected from a quality supplier, with precision measurements, but at a much more affordable.