I had HID bulbs in mine for a few weeks and there was slight shaking on the passenger side. The spring clip that holds the bulb in place is just not up to the task of holding the bulb securely in the socket.
Also I swapped out the H1 HID 6000K Xenon bulbs for H1 4300K Halogen bulbs to see if...
I installed a set of these blacked-out Spec-D light assemblies into my '03 4Runner last weekend and here's my feedback from the process.
I purchased from ProTuning Labs with the 6500K HID bulbs already retrofitted into the assembly, and all HID wiring harnesses included.
Headlamp assembly...