Is it that they all stem from the same original car, the Glasspar G2?
I know that's not a detailed answer, but if I'm on the right track I can take it from there...
We had that 4th series car a while ago, though not particularly mentioned...
The one I mean was one of PJ's.
My NEH 551 was a Lancer, but not any of the cars pictured in this puzzle.
A search by me doesn't reveal a Lancer posted by PJ in the Solved section...