VW Beetle: Rear engined, swing arm suspension, air cooled, flat four. Available as two door and as van/truck. Sold by the millions
GM's idea? Corvair: Rear engined, swing arm suspension, air cooled, flat SIX! Available as sedan and as van/truck. Didn't sell too well, would have been dropped even earlier but GM didn't want Ralph to think he was right.
VW Rabbit: Transverse engined, watercooled four. Sold by the millions.
GM's idea? Citation: Transverse engined, watercooled SIX. Sold about as well as the Corvair, and Chevette, and Vega.
Chrysler: Dodge Omni 4 door.
What's GM up to now? Look at at a used VW.