multiple large side windows was designed, possibly to improve rear 3/4 vision. The engine, transmission and rear differential were all 400 GT units. This car was completed and driven by Lamborghini test drivers, but was subsequently stored uncovered in a field behind the Lamborghini factory. It is now in the collection of the Museo Ferruccio Lamborghini. Lancomatic suspension prototype One Espada was fitted with a prototype hydropneumatic self-leveling rear suspension called "Lancomatic." This car was shown at the 1968 Turin Auto Show, but remained a one-off experiment and did not enter production. The suspension system was developed in collaboration with Langen, a German company owned by the suspension component manufacturer Ehrenreich. This system was possibly developed in order to compete with the Ferrari 365 GT 2+2, which was also equipped with self-leveling rear suspension. According to Lamborghini test driver Bob Wallace, the Lancomatic suspension was promising but very costly and had significant technical issues, including seal failure due to heat and friction and harsh ride quality. Lamborghini Faena The Lamborghini Faena is a one-off 4-door saloon based on a Series II Espada and built by coachbuilder Pietro Frua. It debuted at the 1978 Turin Motor Show, and was later shown at the 1980 Geneva Motor Show. The Faena was built on the chassis of a 1974 Espada Series II (number 8224). Following this conversion, the chassis was renumbered to 18224. The Faena was constructed over a period of eight months. The chassis was reinforced and the wheelbase extended by to accommodate rear doors. As a result, it was significantly heavier than an Espada, weighing almost . The interior was luxuriously finished in white leather and the new bodywork incorporated taillights from a Citroen SM. After being exhibited at the 1980 Geneva Motor Show, the Faena was sold by Lamborghini dealer Lambo-Motor AG in Basel. It is currently owned by a Swiss collector. The name Faena (literally, "job" or "chore") refers to the final stage of a Spanish-style bullfight. Revival attempts In 1999, a new version of the Espada was rumored to be in the works, but it was right at the time Lamborghini wanted to concentrate on a Diablo successor, so little became of the idea aside from a few drawings. In 2006, Edmunds.com reported that Lamborghini intended to revive the Espada in 2009. Lamborghini presented the 4-seat Estoque concept car at the 2008 Paris Motor Show, however no production