changes, while the engines were now capable of meeting the most recent emissions regulations, marketed as Nissan NAPS. This means that the 610 was available with three different front ends: original, facelift, and the "shark-nose" six-cylinder front. A minor upgrade to the front suspension (offset strut tops) for the 610 led to slightly improved handling before the introduction of the 810. Australia In Australia, Datsun released the locally produced 180B in October 1972 as a four-door sedan in Deluxe and GL trims, and a two-door SSS coupe. The engine fitted was the 1.8-liter L18 engine paired to a four-speed manual or three-speed automatic transmission; Datsun upgraded the SSS to a five-speed manual in 1975. Over the base Deluxe, GL models added: vinyl roof, radio with separate speaker, upgraded interior upholstery and trim, cut-pile interior carpeting, chrome exhaust extension, rear mounted GL badge, and whitewall tyres. In early 1974, wrap-around front indicators, new tail-lights and cabin trim changes heralded a range-wide facelift, while a fully imported (not locally manufactured) luxury GX sedan arrived in November 1974. The GX model could only be differentiated on the exterior by its grille, wipers and badges, although the interior gained luxuries such as cloth inserts for the vinyl upholstery and a three-way adjustable driving seat (fore/aft, recline, thigh support). A GX wagon followed in June 1975, followed by a minor trim and grille facelift in 1976. The 180B proved popular right to its discontinuation in October 1977, when the P810 200B range arrived in Australia. North America In the United States and Canada, the car was sold simply as the "Datsun 610". The four-door sedans, a two-door hardtop coupé, and a five-door station wagon were available, and were marketed as a more luxurious and larger product than the 510. For 1973 and 1974, North America was the only market outside Japan to have its 610 HT models equipped with the unique, six-bulb tail lights that covered the entire rear panel, requiring the license plate to be mounted below the rear bumper. The car originally received criticisms for elevated noise levels and engine drivability problems; Nissan responded with engine improvements during 1973 and a new engine for 1974, mounted on new engine mounts to lower noise and vibration. The window seals were also modified, to lower wind noise. While the original Datsun 610 had a 1770 cc L18 engine, 1974–1976 610s received the larger 2.0-liter L20B