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You may remember Retrobuilt's modern rendition of the '69 Shelby GT500 from our April 2010 issue. They brought their new Mach 1 version to Shelbyfest. Built on a '10 Mustang GT, the Mach features a '69 Mustang-style fiberglass front end along with fiberglass body panels over the original door and rear quarter sheetmetal to replicate the '69 Mustang styling. You have to look twice to realize it's not a real '69 Mach 1.