1967-onward launch-year of the Pontiac Firebird pony-car track on the 1967-onward F-body 108-inch unibody (shared with the 1967-onward Chevrolet Camaro).

The 1967-onward Pontiac-side vs Chevrolet-side cowl tag discriminator.

The 1969-only Trans Am homologation specialty (NOT the 1967-onward — Trans Am is a 1969-onward fitment).

1968-onward sequel-year — the 1968-onward revised rear-deck stamping, the 1968-onward Pontiac-side cowl tag authentication chain, the 1968-onward OHC 6-cylinder / 326 / 350 option chain.

1969-only launch-year of the Trans Am trim package option — the 1969-only RPO WS4 T/A Trans Am option code, the 1969-onward Pontiac 400 cu in V8 base, the 1969-only endura body-colored front fascia, the 1969-onward revised Pontiac-side cowl tag authentication chain.

1970-only Trans Am high-output 400 cu in V8 (the 1970-only Pontiac 400 with Ram Air III / IV option chain), the 1970-onward revised spoiler / hood / fender trim, the 1970-onward second-gen carry-in chrome trim.

1971-onward sequel-year — the 1971-onward revised Pontiac 455 cu in V8 carryover with the 1971-only Ram Air V specialty, the 1971-onward revised Endura front fascia, the 1971-onward emissions-era compression-floor carryover.

1972-onward sequel-year-2 — the 1972-onward Pontiac 455 cu in reduced-output carryover at 300 hp / 310 hp nominal, the 1972-onward revised cowl tag authentication chain, the 1972-onward split-bumper federalized package.

1973-onward sequel-year-3 — the 1973-onward Pontiac 455 cu in reduced-output carryover at 310 hp nominal, the 1973-only Super Duty 455 cu in fitment (the 1973-only 310 hp / 375 hp at the 1973-only homologation-specialty window), the 1973-onward revised Endura front fascia.