The seat belt is actually black paper, left over when I was building the Mercedes F1
The doors, it may not be very visible from outside, but part of the dashboard and door has carbon fibre pattern on them.
Before and after comparasion:
Same for the dashboard:
On top of the colors used previously, here are the additional colors used this round:
Grey: Mr Color #40 German Grey
Red: Mr Color #79 Shine Red (Leftover from V-Gundam, could have mixed in a bit of Mr Color #68 Red Madder)