You didn't indicate if your car is Olds or Pontiac powered. The air cleaner base with the trumpet snorkel is the same as all of the other 350/400 4 barrel Pontiac engines found in the A or G body Pontiacs in 1977. Same with the 403 Olds base. The sheetmetal base that is riveted to the scoop is Can Am specific, and there are 2 variations. One for the W72 400 Pontiac engine, and another for the 403 Olds.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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