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This car was built in the US ( vin tag indicates -5A-, being 65 model and the A indicates built in America. Built for export to Mexico.
All these cars received export braces, thus the name “export brace”. It also has an angle iron welded to the cowl where the brace attaches. Similar to what is found on the 65 Shelby only the holes for the bolt would not be equally spaced like they would be on the 65 Shelby. Have seen the angle iron on one other 65 Blue Mustang de Me ico.