Will this bolt directly to my Fusion without any adapters or modifications?

Yes. This assembly is designed to mount at the factory axle points with no drilling, grinding, or custom brackets required. Installation is straightforward with basic hand tools.

Do I need to remove the old hub completely, or can I replace just the bearing?

The old hub and bearing come off as one unit. This replacement assembly goes in the same way — no pressing bearings or separating parts on your end.

What hardware comes with this, and what do I need to source separately?

The assembly itself is included. Confirm your axle nut size and any brake caliper bolts with your service manual — those are typically reused from your old setup, but check before you start disassembly.