No. The aluminum freehubs attach in a completely different method and cannot be replaced by the 7-speed freehub. However, I think the Shimano hubs with steel or titanium freehubs all use the same attachment method (except for the old Dura-Ace 7400 hubs). Scratch that: According to techdocs.shimano.com, some of the new hubs, e.g. FH-7850 and FH-7900, use a "standard" looking freehub spline pattern but use a 14mm fixing bolt instead of a 10mm fixing bolt. I do not know if a 7-speed freehub would fit in those hub bodies (I kinda doubt it).