M20 [all BB]: P9A01A, P9A13A, P9A14A, P9B01A.
M21 [L34, L78]: P9A22B, P9A23B [best for L521xxx]; P9A04B [best for L522xxx]. That’s correct; not used in date order.
M22 [L78-no 02A examples these are known M22 Camaro dates]: P9T30C, P9A06C, P9A24C, P9A27C, P9A31C.
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