Stop in for a cup of coffee

I know a lot of you know a lot more about GM cars than you like to let on, so:

Why do the ends of my Monte Carlo’s front coil springs have to be visible through the first hole in the seat in the lower control arm, but either partially or non-visible through the second hole? The assembly manual says they do, and when I look for a reason why, everybody online dutifully repeats this requirement but nobody says why it’s important. I doubt they know..

It just does....

How exactly does a posi rear end on a Plymouth work... It just does...