Do I need to flush the system before installing this condenser?

Yes. Flush the refrigerant lines and receiver-drier before installing the new condenser to remove any debris or contamination left from the old unit. Skip this step and you risk clogging the new condenser immediately.

What mounting hardware comes with this?

The condenser assembly itself arrives ready to bolt to factory attachment points. Bring your own fasteners and refrigerant hoses — the condenser does not include those items.

Will this work if my original condenser failed due to internal corrosion?

Aluminum construction resists corrosion better than older designs, but the root cause of your failure still matters. If sediment or debris damaged the old unit, flush the entire AC system first or you'll shorten this condenser's life too.