Hi Coenen93:
The paint on your truck looks like it may be the original color. Since you dont have the glovebox option list sheet you will just have to figure it out. Based on the year of your truck you can google the paint codes by doing a search of "197X Chevy truck paint codes" where the "X" is your year. Look at the insides of your doors, under the dashboard and the engine firewall to see if there is a consistent color which may be the original one and compare with the code charts on the internet.
Regards,
Henry