Can I add custom trim moulding?

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Can anyone direct me to some info on adding the upper and lower trim mouldings to a truck that came with none? I want to do the white in the center color scheme (custom deluxe??) but my truck currently is just a plain jane C20 with no trim at all. Looking at getting a custom cab- so it has the holes already. Just wondering if there's a thread or procedure for adding the trim- or links to any threads about custom paint/striping. I have searched but not really found what I am looking for. Thanks.