mustang77The first-generation Mustangs grew in size; the 1973 model had become markedly larger than the orinal model. The pony car market segment saw decreasing sales in the early-1970s with many buyers turning to lower-priced,Bid for the chance to own a 1977 Ford Mustang II Ghia 4-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars on. Lot #54,390.