I'm with you on this one, my aftermarkets don't fit like my OEM's. If they were not broken (the OEM's) I would just plasti-dip them. I don't care about them being glossy, the only thing glossy black on the car is the shadow-line trim. The black bumper and side strips are not glossy...
That glossifier stuff stems to work pretty well though, I watched a video about it one day...