I just received new headlight and signal light bezels as well as grills from OER for my 79 Z28. I am trying to match the factory as much as possible. Do the bezels need to be painted or is the finish from OER going to hold up to the environment? If it must be painted (either to match factory or to protect it from the environment), what sheen of black (flat, semi-gloss, etc) should the bezels be painted? Do the grills need to be painted or are they fine with the no sheen black from OER?