Can anyone tell me what the correct headset bearings are for a 2020 Xduro Allmtn 3.0 as mine are starting to go, feeling them grinding when turning the bars. I did ask haibike but they won't tell me, they only replied to say to go to my local dealer and they will order from them, my nearest dealer is about 80 miles away so isn't any good, plus it's only two bearings which are very easy to replace. I have cleaned the top and bottom and there were no markings, I've never had to buy them before and there seem to be way too many choices, not sure whether they measure the inner or outer diameter?