Will this radiator work as a drop-in replacement without any custom brackets?

Yes. This radiator uses factory mounting points — no drilling, welding, or custom fabrication needed. Unbolt the old unit and bolt this one in its place.

Do I need to flush the cooling system before installing this radiator?

Best practice is to flush your system before any radiator swap. Old coolant can contain sediment that clogs a fresh core and kills efficiency. Use the opportunity to run fresh fluid through the whole system.

Does this come with hoses or clamps?

The radiator assembly is included. Hoses and clamps are typically reusable from your existing setup — inspect them for cracks or hardening and replace if needed, but they aren't included in this kit.