 In a major change, Ford and Mercury introduced "pillarless hardtops", using frameless door glass on both hardtops and four-door sedans; vent windows were discontinued.Redesigned door handles no longer protruded from the exterior; rear fender skirts were standardized on all full-size Mercury sedans except the base-trim Monterey.The Monterey and Marquis convertibles were discontinued for 1971, leaving the Cougar as the sole Mercury convertible.