FWIW: 8, 9 and 10 freehubs are all the same (pretty sure 11sp too but you might need a spacer). These will have width 130mm (road) 135mm (mtn/ touring)
126mm hubs (6/7sp) will have splines that will accept the sprockets but are narrower such that you will only get 7 of and 8sp cassette, 8 of a...