two-doors, 118-inch for four-doors and station wagons). True four-door hardtops were replaced by "pillared hardtops" (frameless door glass remained, supported by a thin B-pillar), while two-door Montegos retained hardtop roofs, though with much wider C-pillars. The Cyclone had reverted from a stand-alone model line to an option package for 1972 for the Montego; only 30 1972 Cyclones would be produced, making it among the rarest Mercury vehicles. As a replacement for the Cyclone, Mercury introduced the Montego GT, a counterpart of the Ford Gran Torino SportsRoof for the first time; the Montego GT was offered from 1972 to 1973. As a standard engine, the Montego was equipped with a 250 cubic-inch inline-six, with five different V8 engines available as options. Starting in 1974, the Mercury Montego was available with a 460 V8, shared with the Mercury Marquis/Colony Park. The redesign was initially met with success, as 1972 Montego sales increased 136% over 1971; the MX Brougham saw the largest increases in sales, as the two-door increased its sales by 897% while the four-door increased by 1,021%. Following the 1973 gas crisis, sales were depressed by industry-wide fuel economy concerns. The redesigned 1974 Mercury Cougar shifted from the Ford Mustang chassis and upsized to Montego two door bodies which were also shared with the mid-year addition of the Ford Elite. The new Cougar which was more competitive in the growing intermediate personal luxury car segment produced model overlap causing slower sales of the Montego along with the success of the Mercury Monarch, as buyers shifted from intermediates and full-size cars towards fuel-efficient compact sedans. For 1975, the six-cylinder and 302 V8 engines were dropped from the lineup, leaving the 351 V8 as the standard engine. For 1977, in a mid-cycle redesign of the Ford intermediate lines, several nameplates were shifted. Mercury rebranded the Montego as the Cougar, in favor of offering a full range of body styles for the Cougar line alongside the flagship XR7 personal luxury coupe; Ford rebranded the Torino/Gran Torino as a facelifted LTD II, with the Elite rebranded as a downsized 1977 Thunderbird. Third generation (2005–2007) For the 2005 model year, Mercury revived the Montego nameplate after a 28-year hiatus. The Mercury counterpart of the Ford Five Hundred, the third-generation Montego entered production on July 12, 2004. Slotted below the Grand Marquis, the third-generation Montego was introduced as a replacement for the Sable alongside the 2006 Milan.