Basic moulding question

[Hawssie]

I was thinking about doing a two tone paint job with moulding such as this truck. I have noticed they have wood grain and black lower moulding and I have seen wood grain as one of my blazers has it. My question is what type of moulding is used for the trucks with lower and upper moulding. What does the the top moulding match to, the black or the wood grain, or is if just silver that matches to either? I don't want to order the wrong bottom moulding and have it not match the top moulding.