The Pontiac application is 1971-74 all 4spd M-22 Muncie. The part number crosses over to all GM car lines except Cadillac.
Also please check my other auctions for more NOS Muncie gears and parts. The item "1969 1970 1971 1972 GTO 442 CHEVELLE CAMARO FIREBIRD NOVA NOS M-22 MAIN SHAFT SS" is in sale since Sunday, January 3, 2021. This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Transmission & Drivetrain".The seller is "ravjudge" and is located in Le Mars, Iowa. This item can be shipped to United States.