Vinyl roof

Vinyl roof refers to a vinyl covering for an automobile's top.
This covering was originally designed to give the appearance of a convertible to models with a fixed roof, but eventually it evolved into a styling statement in its own right. Vinyl roofs were most popular in the American market, and they are considered one of the period hallmarks of 1970s Detroit cars. Vinyl roofs were also popular on European- (especially UK-) and Japanese-built cars during the 1970s, and tended to be applied to sporting or luxury trim versions of standard saloon (sedan) models.
History.
The first use of this technique goes back to the 1920s, when leather, canvas and vinyl were sometimes used along with landau bars, to give a fairly accurate reproduction of a horse-drawn carriage's movable top. An early example of this was the 1928 - 1929 Ford Model "A" Special Coupe, that featured a roof completely covered with a vinyl-like material. This Model "A" Special Coupe's vinyl roof had two exposed seams on the back corners, with a lateral seam on the top covered with a narrow trim strip; landau bars were not provided on this model. The technique fell out of favor in the 1930s and 1940s, when smoother, "envelope" bodies began to be fashionable; for these designs, the look of the modern, integrated metal roof was important.
Lincoln used the convertible look on some of its Cosmopolitan coupes in the 1950s, as did the Kaiser firm on its Manhattan sedans, although the material was still canvas. In the very late-1950s, Chrysler's Imperial made a limited use of true vinyl on some models. Probably the first modern vinyl roof as it would later be accepted, though, was the 1956 Cadillac Eldorado Seville that came standard with a roof covered in an early vinyl material called "Vicodec" with two parallel seams running the length of the roof. Ford followed a few years later with a vinyl roof option on the 1962 Ford Thunderbird, a car which also re-introduced landau bars as a styling touch. The vinyl covering proved popular, and some form of vinyl trim would be seen on Thunderbird roofs for the next two decades.
Other manufacturers noticed immediately that the new look could be profitable – it did not cost very much to add, but many buyers willingly paid a premium for it. Vinyl appeared on some coupe models in GM's 1962 full-size line. Chrysler made a vinyl roof available on the Dodge Dart. Ford soon offered it on the first Mustang as well. By mid-decade, four-doors as well as coupes could be topped with a number of colorful vinyls.
From that point on, vinyl proliferated rapidly and became very common in most car classes by the late-1960s, even appearing on some station wagons. Vinyls were produced that mimicked other materials such as canvas, and even alligator or snake hide. Chrysler briefly produced some patterns, with paisley or floral designs – this was called the "Mod Top" option. The Mercury Cougar briefly offered a houndstooth pattern. There was even an aftermarket spray-on product that claimed to add that factory vinyl look. By 1972, even the humble Ford Pinto sported a vinyl roof option, and a Ford sales brochure of the time conceded that vinyl was mostly for looks.
At about that same time, the modern opera window first appeared, and it went so well with a vinyl surround that the two together became emblematic of American body design in the 1970s. During this period, vinyl with padding under it was sometimes used, allowing the top to somewhat mimic the feel as well as the look of a genuine convertible. 
European and Japanese manufacturers were not immune to this trend. Chrysler used it on upmarket models of its Hunter and Avenger saloons; Ford had vinyl roofs on Escorts, Cortinas, Taunuses, and Granadas into the early 1980s. British Leyland had vinyl roofs on the last Wolseley and top-end Princess models, and optional for all other models. Toyota adopted vinyl roofs for its Corona Mark II, Crown and Century sedans in the mid-1970s, and they could be found on Nissan Laurels, Cedrics, and Glorias.
Vinyl continued to appear in many car lines through the 1980s, but the coming of the "aero look," first introduced to the U.S. market by the 1983 Thunderbird, tended to militate against both opera windows and vinyl roofs, as their more formal style did not go well with the sleek profile designers were beginning to emphasize. During this final phase, canvas-look tops, often called cabriolet roofs, with simulated convertible top bows under the fabric, gained some popularity. The availability of all vinyl styles dwindled in the 1990s, until the 2002 Lincoln Continental offered one of the last factory applied versions.
Hearse and limousine bodies almost universally still have vinyl tops. Not only are they part of the expected style of those vehicles, but they have a practical advantage in covering up the welded body seams that result when standard sedans are stretched to greater length. Aftermarket customizers also continue to install vinyl roofs of various types. These are usually seen on Cadillacs and Lincolns, but can be fitted to virtually any kind of car.
Styles.
Four styles of vinyl roof evolved during the 1960s and 1970s, with a couple of variants:
Company styles.
The above styles were all used by more than one manufacturer. Two others were unique to one company or nearly so:
The opera window was mounted in this pillar and was surrounded by sheet metal, not touching either vinyl area. Three pieces of glass were mounted on each side of these cars; the Fairmont Futura had a very similar style, differing only in not using the center opera window. A comparable two-piece roof covering was available on the AMC Pacer that emphasized the bump in the roof that accommodated the roll bar over the passenger compartment.
See also: Car body styles