Does this radiator come with a new thermostat housing or inlet neck?

The assembly ships as a complete radiator core only. Reuse your existing inlet/outlet fittings if they're in good condition, or source them separately if replacement is needed.

Can I flush my old coolant through this radiator before the first full fill?

Flush the entire cooling system before install — don't reuse old coolant. Fresh fluid ensures the radiator won't clog and your engine maintains proper temperature control from day one.

What mounting brackets or hardware come with this?

The radiator assembly includes the core and end tanks. Factory mounting brackets and rubber isolators vary by vehicle — confirm your current setup before ordering to ensure compatibility.