Beginning in 1966, the Comet grew from a compact to become a mid-sized car. It was now based on the same chassis as the Ford Fairlane intermediate (and the previous Mercury Meteor intermediate which was only offered in 1962-1963). These intermediate-sized cars used the same basic chassis as the original Ford Falcon and Mercury Comet compacts, but were stretched with longer wheelbases. The previous generation Comet shared its platform with the all-new Ford Mustang in 1964, and when the Comet graduated to the intermediate platform, the Mercury Cougar became the platform shared with the Mustang.
