When I fitted my facelift headlights a while ago I would have made up two small brackets...Didn't have any real tools tho, so I found some really hard foam (white plastic foam which were used to support a TV during transportation I guess). I took a pair of scissors and made two pieces of 12 cm length and pressed it in between the lowest part of the headlight and the topsurface of the bumper...it kinda got stuck between the lamp and the bumper...then I took a plastic strip-lock and threaded that in a hole in the lamp and wrapped it around some bolts that holds the radiator and tightened it up...
The lamp sits rocksolid...only if it gets REALLY bumpy and I drive fast the light flickers slightly, I mean you hardly notice...
Cheap mod, but a bracket would be better. Later found out that you can buy these brackets readymade from ebay...8-10 euros