The carb vent tube hole should be about 3/4" in diameter and I didn't see it in your pictures above, but, maybe it is there. I would just list it as a '70-'72 dual snorkel air cleaner. If it doesn't have the carb vent tube hole, it is correct for early '70. The carb vent tube hole could always be added if needed. If it does have the hole, then it is correct for late '70 through '72.
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1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
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