Do I need to transfer my existing rotor and caliper?

Yes. The knuckle assembly ships with brake hardware mounted, but you'll need to move your rotor and caliper from the old knuckle over to this one. It's a straightforward swap on the stock mounting points.

Can I reuse my old axle and tie-rod, or do I need new ones?

The axle slides into the hub and the tie-rod attaches at the steering arm—both existing components work with this assembly. Inspect them for wear before reinstalling; if either shows play or damage, that's the time to replace.

What if I need different brake hardware or a different rotor size?

This assembly comes as Honda built it from the factory. If you're upgrading to a larger rotor or different caliper setup, you'll need to source those parts separately and confirm compatibility before bolting on the knuckle.