Thanks all for your response.
I also got a friend that is a sand blaster and hobby painter. He also think a PPG code for the interior exist, but it seems hard to find. I guess the solution is to bring some part from the interior to the paint shop for scanning. It also a problem that the color on the interior also have changed over time. But I guess it's best to bring with me some of the vinyl parts, they seems not to have changed so much as the metal details.