on the rear half-shafts. As on the series I, 205VR15 Pirelli Cinturato CN72 tyres were fitted, suiting the cars handling until power steering was offered as an option. 575 Series II Espadas were made, making it the mass produced variant. Series III The Espada S3 was launched in 1972. With this revision, the interior now incorporated a redesigned aluminum-trimmed instrument panel that kept all instruments and most controls (including the radio) within easy reach of the driver. Several exterior changes were also made. Newly designed wheels on five-stud hubs replaced the earlier knock-off wheels. These wheels were also used on some late S2 Espadas. They were fitted with wider Pirelli Cinturato 215/70WR15 CN12 tyres. The front grille now had a square instead of hexagonal mesh. New tail lights were used, sourced from the Alfa Romeo 1750 Berlina. A sunroof was now available as an option. The engine was carried over from the S2. Power steering by ZF and air conditioning were now standard. Spring and shock absorber tuning was altered slightly. In 1974, a Chrysler Torqueflite 3 speed automatic transmission became available as an option. From 1975, large impact bumpers had to be installed to meet United States safety requirements. US emissions requirements also led to the factory adding a secondary air injection pump and special tuning of carburetors and the ignition system. Some people consider these later US-spec cars as a separate fourth series, but Lamborghini did not officially change the model designation. Specifications The Espada used a semi-monocoque unibody, constructed of pressed sheet steel and square section steel tubing. The hood was constructed of aluminum. This chassis was a new design manufactured by Marchesi of Modena, the firm that also constructed Miura and Islero chassis. Bare chassis were shipped from Marchesi to Bertone, where bodywork, paint and trim were added prior to final assembly at the Lamborghini factory. The steel chassis and bodywork suffered from rust issues, with journalist Denis Jenkinson observing visible rust on a car with 10,000 miles during a 1972 road test. Suspension was based on the earlier 400 GT 2+2 design. It was fully independent, with unequal length double wishbones, coil springs, hydraulic shock absorbers and anti-roll bars. Four wheel disc brakes were manufactured by Girling. All calipers had three pistons, with larger calipers used in the front. Solid discs were used at first, with vented discs added for the Series II Espada. The