I have a cane creek is-3 headset on a fuel 9.8, the seals are rubbish and the bearing is full of crud and rust and slipping in the frame. I can get a stainless ball replacement for the top bearing but the best I can find for the lower is a pro sealed cartridge is 52/40 from mountain bikes direct not even sure if the angles are right it does not say. Does anyone know where I can get a good quality replacement 40 x 52 x 6.5 36x45*? It seems to be a very common bearing.