Confirmation or correction on my observations of the below...
1) Wheel-well trim: After-market?
2) Front-bumper: Chrome not standard on a Mach-1... But factory/optional on a Boss?
3) Side-decals: Factory-default? Delete-able?
4) Side bright-trim: Choice of this or side decals?
5) Side bright-trim and Decals available factory?
Im no expert and im sure some other will chime in and correct me if im wrong but I will give it a try.
1. No, you could get wheel trim from factory.
2. Correct. No chrome bumper on Mach 1 but standard on Boss.
3. You could get mach 1 with or without side stripes.
4. Yes, I believe it was one or the other but not both.
5. No. Not together in a package.
Others on here will know way more than me, but I think this is right.
The car in the pic looks like it was a standard mach 1 with bright molding and someone along the way added the stripes and swapped out the front bumper.