Well maybe the Corvair, Fiero, and Solstice have a lot in common. All had engines between 2400 and 2800 ccs. Both Fiero and Corvair were autocrossed heavilly. Both had a large "cult" following. Both were "image" cars.
Further, ever since Pontiacs lost their suspenders, there has alway been someone pushing for a two seater. From that standpoint the Solstice has more in common with the 1964 Banshee right down to the clamshell rear compartment opening than any more modern car (that was supposed to go into production also. Didn't). The Fiero was touted ans an "economy" car (even was a high mpg version that few ever saw) to get it past the corporate bean counters.
BTW the Nov 9, 1982 Fiero announcement starts off "Pontiac announced today that its 1984 two seater sports car..." For that matter, if the engine is behind the front axle, it too could be called "2M4".
Must admit I am biased. My preference is for oddball cars and for GM cars so when I get the chance for both in one it is a good day.
ps I won a lot of autocrosses with an "improved" '65 Corvair Corsa (140 hp) convertible (also had a Corvan and a Fitch Phoenix). I have an '86 Fiero 2.8 sitting in the garage & my son learned to drive with an '84. Daily driver, hobby, and lifestyle is an '88 Reatta. Grew up with a gaggle of Jags. I really like six cyl engines also, straight, flat, or Vee. :smile