Originally Posted by
CliffordK
There are also transition Shimano freehubs that will fit either Hyperglide or Uniglide cassettes.
It might be worth installing if you can locate one.
Many of the Shimano branded freehubs are similar enough to allow them to be swapped.
I'm guessing the UG cassettes will fit HG bodies without modification, since what seems to be the only difference is the one tab, (narrow UG tab in wider HG slot).