Great!!! Part II is on the way shortly....
The dealer where I got the Mirage has these stripes on many of the cars there. The stripes are a contrasting but complimentary color (depending on the body color) and only appear on the bottom (nothing on the hood / roof / etc..). I'm guessing these are a local addition and not a factory option (although initially I thought they were...) There's a better pic at the end of Part II DIY. The trailing end of the stripe on the lower rear passenger doors spells out "MIRAGE" There is a break between the R and A and a palm tree is depicted... Between the color of the car and the addition of the stripe, I feel like I'm always on vacation (even though it's been decades since one of those!!)
~CrazyJerry