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Yes, there is only one dual snorkel air cleaner for cars in 1971. Only 383 and 440 engines used it.

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There are 2 versions of the '71 style air cleaner:
early w/the passenger side snorkel like a '70 (NO-hump)
late w/the passenger side snorkel like a '72 (HUMP)

I have no idea what time frame 1971 model year Hamtramck (N1B) 383-4bbl e-bodies switched from early-to-late style.

** about 5500 total cars (- N96 383 4-bbl w/SHAKERs) at Hamtramck used that air cleaner