The Mercury Grand Marquis is an automobile that was sold by the Mercury division of Ford Motor Company from 1975 until 2011. From 1975 until 1982, it was the premium model of the Mercury Marquis line of full-size sedans, becoming a standalone model line in 1983. For 2003 and 2004, it was sold alongside the revival of the Mercury Marauder. From 1979 until its 2011 discontinuation, the Grand Marquis shared the rear-wheel drive Panther platform with the Lincoln Town Car and the Ford (LTD) Crown Victoria. For 31 years, the Grand Marquis and Crown Victoria were functionally identical twins, built together on the same assembly line in Canada with only minor trim styling separating them. Produced across three generations, the Grand Marquis was offered nearly exclusively as a four-door sedan; a two-door sedan was marketed from 1975 until 1986. From 1983 until 1991, the model line included the wood-trimmed Mercury Colony Park station wagon. During its production, the Grand Marquis was manufactured at two facilities alongside the (LTD) Crown Victoria and Mercury Marquis: the St. Louis Assembly Plant in Hazelwood, Missouri (1979-1985) and the St. Thomas Assembly Plant in Southwold, Ontario, Canada (1986-2011). While the discontinuation of the Mercury brand was announced during 2010, Mercury produced a limited run of 2011 vehicles. On January 4, 2011, the final Grand Marquis rolled off the assembly line, becoming the final Mercury vehicle ever produced. 1975–1978 For the 1967 model year, Mercury debuted the Marquis model line, introducing it as the Mercury counterpart of the Ford LTD. From 1967 to 1968, the Marquis was a two-door hardtop version of the Mercury Monterey. For 1969, Mercury reconfigured its full-size model range. While the Marquis was expanded to a full model range, the Montclair and Park Lane were discontinued, with the Marquis adopting the Brougham trim of the Park Lane; the Colony Park station wagon became its own product line. Replacing the S-55, the Marauder was revived as a fastback variant of the Marquis, lasting through 1970. For 1974, the Grand Marquis nameplate made its first appearance, introduced as an interior trim package of the Marquis Brougham. In addition to a wood-trim steering wheel, the interior was fitted with leather-and-velour split-bench seats. For 1975, Mercury discontinued the Monterey (a Mercury nameplate since 1950), with the Marquis becoming the sole full-size Mercury product line. To expand its full-size model range upward, the Grand Marquis became the