it sounds like this might be your first time using an automatic. The button is just to lock/unlock the shifter so you can change gears or in this change reverse/neutral/drive so you don't accidentally go into reverse while driving
the car year is when it was release for Japan. For the US this article does a better job explaining
https://www.chicagotribune.com/autos/sc-car-model-years-reason-autocover-1103-20161101-story.html
the stripe and "rear spoiler" i just made it with lines. I think i uploaded the design if you can search for "A91" in the game. for the carbon fiber decal just look at most popular decal and I went with the second carbon fiber one
I haven't seen any supra with this. Is there any value in having this on the supra for more chassis strength?
https://www.realoem.com/bmw/enUS/showparts?id=HF93-USA-03-2019-G29-BMW-Z4_M40i&diagId=51_A433#51617426097
(Z4)
(Supra)
Here’s mine with A91 spoiler and stripe with fake TRD trim and Carbon Fiber roof and hood decals (I forgot to do the side garnish and no HDR in the photo I forgot to turn it on)
usually when they change the design they only camo the parts that changed or maybe this is just the og camo car and they didn't bother changing the camo