Widely regarded as a design classic, the Spider remained in production for almost three decades with only minor aesthetic and mechanical changes. The three first series were assembled by Pininfarina in Grugliasco and the fourth series in San Giorgio Canavese. The last Spider was produced in April 1993, it was also the last rear wheel drive Alfa Romeo produced before Alfa Romeo 8C Competizione was introduced.
The Spider underwent a major styling revamp in 1983, which saw the introduction of black rubber front and rear bumpers. The front bumper incorporated the grille and a small soft rubber spoiler was added to the trunk lid. The change altered the exterior appearance of the car considerably and was not universally praised by enthusiasts. Various other minor mechanical and aesthetic modifications were also made, and the 1600 car (never available in North America) dropped the "Junior" name.
The Quadrifoglio Verde (Green Fourleaf Clover) model was introduced in 1986, with many aesthetic tweaks, including sideskirts, mirrors, new front and rear spoilers, hard rubber trunk mounted spoilers with integral 3rd stoplight and optional removable hardtop. It was otherwise mechanically identical to the standard Spider Veloce model, with a 1962 cc double overhead cam, four-cylinder engine (twin two-barrel carburetors in Europe; North American models retained the Bosch L-Jetronic fuel injection introduced for the 1982 model year except that the VVT mechanism was now L-Jet activated) and five-speed manual transmission.
Source: Wikipedia, 2011