Bike - Know you freehub compatibility

While I trying to build new rear wheel. And saw one ads about hub. And the seller don't has no idea about the compatibility. Thats why I do research and found this on.
Shimano RSX FH-A416 - 8speed Freehub Body

8speed Freehub Body, however you can chain the freehub body with 8/9/10
Reference FH-A416.PDF  and Cassette Mech