The front inner arches on my car were green, so body colour. I'll poke around the rear arches when I'm in the garage on Thursday. I was planning on painting the inner arches black as they haven't received the same level of prep as the rest of the body. I'll also be painting the spare tire area and engine bay black, but I haven't decided if I'll go gloss or mat finish. And, I'll most likely spray the black bits before I paint the body. I may even delay wet sanding the high build until I have the black painted as any overspray will be removed with the guide cote.
As for the paint codes, I think I'll swing by a paint supplier and see if they can cross the original codes. I was hoping to find a modern code on the interwebs, but nothing so far, though the Nexa or ICI paint codes might be helpful.
Rod