I worked on iron-caliper Girling GR-3 brakes on a non-GR-3 car with Gotti 15 x 10" wheels running Hoosier tires. With different wheels/tires and aluminum Girlings (stock on Mangustas but not Panteras except GR-4s), you simply have to try it. I own a machine shop so yes- I COULD make the combo fit. It may not look 'stock' at the end but that word is never applied to race cars- or their brakes- anyway.
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