Oh its the radiator cap alright. But you're asking the wrong guy, I had nothing to to with that full retard design lol. All I did was make it look showkar flat, and now I'm back trying to make it all fit again. The rad cap sits much lower, tilted more with only the top edge showing. Its just sitting in the spot saying look at me I'm billet, its not fully installed. I have yet to trim the panel there to make it go on.