thats the LPG cap, had it in the plastic, so as not to drill the bumper...... No rust in a years time.
I agree about the back end looking sly/sleeper ish.
We have several tunnels in Brum, took it through for the first time yesterday... Had to give it some. Shame I had the mother in law in the car, but she seemed to like the roar, coming in through my window, with the artic blast