Is oem fuel door plastic or metal?

[NineIronUS]

That's what I had in mind Green Lantern. I guess I'd have to paint it then since as far as I know, you can't powder coat plastics (anybody?). I've looked at most of the sources everybody has suggested but I really just want a plain black fuel door without a lock (or a handle where the lock hole is). Could have sworn I saw them on eBay before but can't find one now. I have a locking cap already, just want to cover it up.