replacing the standard 3 chevrons found in the same location on the standard full model year Roadmaster model lines. Overall Roadmaster sales dropped to about 33,000. The overall economy was in a recession starting in late 1956 and extending into 1958. For 1958, GM was promoting their fiftieth year of production, and introduced anniversary models for each brand; Cadillac, Buick, Oldsmobile, Pontiac, and Chevrolet. The 1958 models shared a common appearance on the top models for each brand; Cadillac Eldorado Seville, Buick Roadmaster Riviera, Oldsmobile Holiday 88, Pontiac Bonneville Catalina, and the all-new Chevrolet Bel-Air Impala. In 1958, the Roadmaster was available in the well-equipped "75" version, and the body was adorned with bulkier and more heavily chromed styling while the top trim package Limited was the most expensive and fully optioned vehicle. A new "drawer pull" grille was used that Buick called "Fashion-Aire Dynastar", made up of rectangular chrome squares. For the first time since 1948, there were no distinguishing VentiPorts on the front fenders. On the rear deck, the Roadmaster name was spelled out in block lettering beneath a Buick emblem housing the trunk lock keyway. Wheelhouses had bright moldings, rocker panels had an ebbed molding and a large rear fender bright flash with ribbed inserts replaced the previous year's chromed rear fender lower panel. Four headlamps were standard. New brakes featured cast-iron liners in aluminum drums. Sales fell further to about 14,000. There was a complete restyling for 1959, but this time the names of the various series were changed. Not until 1991 would there again be a big Buick known as the Roadmaster; the largest Buick models were renamed the Electra. 1991–1996 The Roadmaster name returned to the Buick line for the 1991 model year after a 33-year absence, with the third generation Buick Estate wagon becoming the Roadmaster Estate. A four-door sedan was added to the Roadmaster line for the 1992 model year, the first rear-wheel drive Buick sedan since 1985. Combined sales showed an over tenfold increase over 1991 thanks in part to an extended production run which had 1992 models going on sale in March 1991. Chassis As with its precursor, the new Roadmaster Estate wagon was based on GM's full-size rear-wheel drive B platform, which was closely related to the GM C-body and D-body chassis reserved for top of the line Buicks and Cadillacs. It rode on the same 115.9-inch wheelbase in