Forum:In GTA V, how are interior colors chosen?

So, in cars like the Progen T20 and just about any car in the game, but this one in particular (I want to know specifically about the T20), there's a trim in the car, visible in FP view. I've seen multiple videos, and few go into FP view, so I can't see for myself. So, I was hoping to find a few answers here:

1) How are interior trims decided? Are they the color that the car comes in when the car is first purchased?

2) Is there a way to change interior trim colors?

3) If so, are the paint type options (metallic, pearlescent, etc.) the same for the trim as for customizing the outside of the car?

Thanks for answers,

T3hPhantom

P.S. Sorry if I get this in the wrong section, this says "Help Desk", so I figured this was the place to look in.