Ah, the Declasse Rahpsody, a very popular car back in GTA IV. Now it is back in style. I based mine on the Mirthmobile from the Wayne's World movie, color and all. Well, except for the rims, which are a mix and match on the Mirthmobile.
Here is the car, the Mirthmobile, or Declasse Rhapsody, is partially based off of. The AMC Pacer.