 The fourth generation (ND) was introduced in 2015 with a new SKYACTIV-G engine and a body size similar to the first generation model, with a Retractable Fastback (RF) variant added later that year.Launched at a time when production of small roadsters had almost come to an end, the Alfa Romeo Spider was the only comparable volume model in production at the time of the MX-5's launch.Just a decade earlier, a host of similar models—notably the MG B, Triumph TR7, Triumph Spitfire, and Fiat Spider—had been available.