It had to be changed because it stopped working and gave the bulb warning, never felt safe with it blown. Anyways...

5 bangs to the head, 3 broken clips, 2 scraped knuckles and a lost screw later its in and working.

But the replacement had different fittings on the rear as the old one. I couldn't get it to sit just right, its tight-ish and seems waterproof. Anyone else had problems with them going or changing them?