David Obendorfer create a proper convertible version of the Fiat 500, and call it the Fiat 500 Spider.

The Fiat 500 Spider concept features all of the 500′s trademark styling cues, like the cutesy rounded headlights, retro grille and short front and rear overhangs. Obendorfer has completely redesigned the car, making it longer, lower, flatter and wider than the original hatchback.  It is a strict two-seater.