Freehub Options:
Shimano HG 8,9,10,11sp mtb alloy freehub kit (P/N 281-31520-K002)
Shimano HG 8,9,10,11sp mtb steel freehub (P/N 281-31520-K001)
Shimano HG 11sp road alloy freehub kit (P/N 281-31520-K006)
Shimano MS 12 speed Microspline freehub kit (281-31520-K007)
SRAM XD steel freehub for 11 and 12 speed eagle cassette kit (P/N 281-31520-K003)
SRAM XD alloy freehub for 11 and 12 speed eagle cassette kit (P/N 281-31520-K004)

Replacement spring and pawl kit P/N 281-31620