The Continental Mark IV is a personal luxury car that was marketed by the Lincoln division of Ford Motor Company from the 1972 to 1976 model years. The third generation of the Mark series, the Mark IV grew in size over its Continental Mark III predecessor. As with the previous generation, the Mark IV saw little direct competition in the American marketplace, competing nearly exclusively against the Cadillac Eldorado (redesigned for 1971). As with the Mark III, the Mark IV shared its chassis with the Ford Thunderbird, with the Mark IV receiving its own bodywork below the windows. Hidden headlights made their return, along with a radiator-style grille, and a Continental spare tire trunklid. For 1976, the Designer Series option package was introduced; in what would become a tradition for the Mark series (and later Lincoln), the option consisted of specially coordinated exterior and interior trims developed between Lincoln and contemporary fashion designers. Ford assembled the Continental Mark IV at its Wixom Assembly Plant (Wixom, Michigan) facility alongside the Ford Thunderbird and the Lincoln Continental. For 1977, the Mark IV underwent a substantial revision, becoming the Continental Mark V.