Hello, if brake line replacement is just a physical swap out, part for part. You will likely have to get bulk line and have it bent to match the current lines. Not an easy job for a do-it-yourself mechanic.
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Specific tools and talent required - contact local auto repair facility.
Time and materials used - there is no of knowing what will be needed until the failed brake lines have actually been removed.
IF bleeder screws are also rusted and cannot be opened - wheel cylinders will have to be replaced as well. Good luck!