1967-1968 Cadillac EldoradoBy the late 1960s, GM's standard-bearer in the personal luxury coupe category was the Cadillac Eldorado, which was also the first Caddy with hidden headlights. Eldorado models had existed for years, but for 1967, it was redesigned to share the same platform as the Riviera and the Oldsmobile Toronado, although with an angular, knife-edged, tail-finned style that set it apart from its less expensive platform mates. In front, retractable covers exposed a horizontal row of quad headlights similar to those in the 1966 and 1967 Riviera, but unlike the Buick, the headlights themselves didn't move.The Eldorado had several other unusual design features that set it apart from its GM cousins. For instance, its C-pillars were so wide that when the rear quarter windows were opened, they slid backward into the pillar rather than down. The hood featured a huge bulge that tapered toward the nose, as the Eldorado had been considered for an enormous V12 or V16 engine. Ultimately, the Eldo ended up with Cadillac's proprietary 429-cubic-inch V8 producing 340 horsepower. The 1967 Eldorado was front-wheel-drive, like the Toronado, although the Riviera that shared the same platform with both of these cars remained rear-wheel-drive. The new Eldorado was a huge sales success, tripling its sales numbers over the 1966 model.