You can find all the replacement parts you need at Escapa.
Like the Shimano FH-M770-S 11-speed freehub body for 9-, 10-, and 11-speed systems
Compatible with a wide range of XT rear hubs:
· FH-M8000
· FH-M770
· FH-M775
· FH-M785
· FH-T780
· WH-M770
· WH-M775
· WH-M776
· WH-M788
· WH-MT75
Includes the core, screw, and washer.