Repaint question

I people!

I´ve some questions about a repaint 737NGX!

1. I would like to customize the color of the ground support equipment (GPU, LPU, etc) what is the texture that can replace the default white by the standard gray of GOL Brazil for example?

2. The levels of the airstair which is the texture that I can paint in the colors of the company?

I´ve used google traslator for write here, sorry about anything.

Tks by attention!