Just replaced the stock headlight insert with a high-performace Hella item.
http://db.hella.com.au/cgi-bin/catal...ew&flmaint=822
This is an H4 headlight for countries where you drive on the left but there would be an equivalent for others.
The headlight has a metal reflector and the quality of the reflector and lens seem far superior to the stock item. I bought it for AU$90 hoping for the best without really knowing whether it would fit. The mounting locators and rubber boot look quite a bit different to stock. However, it all fitted perfectly. The only points to note were that the pilot/parking light holder was a little loose in the Hella reflector and the rubber boot had to be cut to allow the wires from this bulb to pass through it. A couple of winds of electrical tape around the bulb holder snugged it up nicely.
At a glance it looks the same as the stock item, that is until you turn it on. Nice bright beam with good distribution to the sides and the cut-off point (to avoid blinding others) is nice and sharp.