first production car in America with a 4-wheel Anti-lock braking system (ABS) from Bendix, a rarely selected option at that time. A total of 11,569 1971 Imperials were produced with a retail price of US$6,276 for the sedan ($ in dollars ). Although the vinyl top was standard, for a short time a unique paisley-patterned vinyl top in a burgundy color was available as an option on burgundy-painted cars. It has been rumored that this top had actually been overprinted on waste "Mod Top" patterned vinyl, which had been available on some 1969 and 1970 model year Dodge and Plymouth cars, but according to Jeffrey Godshall, a Chrysler designer and frequent contributor to the magazine Collectible Automobile, this was not the case. With exposure to the elements, the burgundy overprint faded, and the pattern began to show through in a purple "paisley" pattern. Chrysler replaced many affected tops with either white or black standard vinyl, but some survive. 1972 (Series HY-M) Evolutionary styling was the basis for completely new sheetmetal for the 1972 model year, giving the cars a bigger and heavier all-around appearance. A somewhat more rounded side profile without a character line down the side and chrome trim on the top seams of the fenders from the rear windows forward appeared. The front fascia was all new and imposing-looking, and the rear featured vertical teardrop taillights for the first time, with side marker lights in the form of shields with eagles on them. Sales increased to 15,796. Two all-black LeBaron sedans were delivered to the US Secret Service, which then turned them over to Hess and Eisenhardt, which converted them into limos for Presidential use. Both cars were used as late as 1981, and carried Ronald Reagan and his staff to Capitol Hill for his presidential swearing-in ceremony in January 1981. 1973 (Series 3Y-M) The 1973 model year saw new federal bumper standards to prevent damage. This meant the Imperials gained large rubber over-riders front and rear, adding to the car's length, making it the longest production car in North America for that year and the longest postwar (non-limousine) production car at . The front bumper ends revived a Woodlite headlamp appearance which was a popular, extra cost item during the 1930s. As 1973 was in general a good year for the auto industry, 16,729 of the 1973 Imperials were built and sold. Fifth generation (1974–1975) With future