My steering has been indexing increasingly over the last few months. I've given up on my LBSs and decided to have a crack at replacing the headset myself. I've taken the thing apart and can clearly see the brinelling on both races. My question is am I buying the right headset? I thought I'd treat the old bike to this nice Stronglight headset. My stem is a 22 mm quill, so I'm assuming that's the right one to choose, but does 'stack height' matter? Or are there any other compatibility issues I'm missing? TIA wise ones.