273 Commando or Not?

First of all thanks to everyone and what an awsome forum. I am leaning towards not a formula S but I am still confused about stripe and the tag says 2 colors and then finding it in the places we did really looks factory. We are puttinig in air right now to inspect the rear end to try and deterime ratio. I also have a couple questions about the stereo equipment, there is a little box mounted to the dash to left of steering wheel and there are speaker boxes mounted to the rear seats as well as what looks like an amp. mounted inside the right quater panel. Were these factory options or A/M, I am attchinng pics. Okay 41teeth on ring and 14 on pinion I think that would make it 2:93?
Thanks Again