I just typed 'old shit' in Google and it came with this rusty texture, then I applied in as a new layer and cut the bits off the hood with the tool in Gimp.
Edit: If you we're talking about the vents, I got them from the 'Templates' section of the forum.
I beg to differ with you LfsNoob this is just my input but the lights 75% of the time make the car look better for example CAOZ skins look fecken amazing big props to that dude and ive seen alot of skins in this forum with paste on lighs but this is just my view