As far as I know (and there are other threads) the SCA car and Graham's car are different. Stuart built his car in 1975 - just for the TT race, which used Trophee de l'avenir rules, far stricter than group 2. He might have converted the car to group 2/76 (which would involve changing the bodywork but little else) but I guess he used a british group 1 Camaro for the 1976 race.
His 1975TT car was sold to Rob Slotemaker early in 1977 - it still had Brut livery on the Amsterdam RAI exhibition but was later resprayed in Martinair colours. The Slotemaker car had the wing extensions like the 1975 TT car (identical to the SCA car) - so I doubt that he replaced them for the 1976TT and reverted the car to 1975 specs before selling it.
Graham had more Camaros - he sold quite a few to the Netherlands in 1977.
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