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The headlight itself isn't well supported.

If your engine is running rough or the CV joints are worn, it will cause more vibration to be transmitted to the engine. If your car is an automatic, shift the car into neutral during the headlight test and it may help reduce vibration at idle. A bad joint can cause vibration on one side.

Also, all projector headlamps are typically supported at 3 points so that they can be adjusted. I guess it might not be supporting it all the way. I wouldn't buy a new light since I don't think it's a light. It should be fine while driving, it's really just at idle that it shakes.
 
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