This 1989 Porsche 911 Speedster is one of 823 US-market examples produced for the model year. It is powered by a 3.2-liter flat-six paired with a G50 five-speed manual transaxle and is finished in Grand Prix White over blue partial leather. Equipment includes a shortened windscreen, a fiberglass twin-hump convertible-top cover panel, and 16" Fuchs…