While the two-door hardtop saw slight changes to its roofline, four-door hardtops were restyled to more closely match their two-door counterparts, with the rear doors receiving more curves to their greenhouse design. The vertically-stacked headlamps introduced in 1965 were replaced by a hidden headlamps; shared with Lincoln-Mercury, the configuration would be a design feature denoting the top-trim LTD for the next decade. The hidden-headlamp system was operated by engine vacuum; if the system were to fail, the headlamp doors retracted up to ensure the headlamps were visible.