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I'm pretty sure the Porsche 917s and Ferrari 512s were in Group 5 (so-called silhouette cars as they came to be known in the later 70s). Those two cars in the classification were designated as SP (Sports Prototype), not as GTs. The 3-lite 908 was a P (Prototype) in Group 6. Cars like the Ferrari 275 GTB were in Group 4.
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