The 1969 Mercury Cougar was sold as the grown-up alternative to a Mustang, with more chrome, a longer wheelbase, and a quieter ride. It could also be ordered with a 428 Cobra Jet, and from April onward with a Boss 302 that no other Cougar could get. This Gateway Classic Cars gallery captures the third-year car. Read on for the option boxes that turned a luxury coupe into something else entirely.