I put new light assemblies and HIDs in my 90. HUGE improvement over standard.
However, they seem to randomly not work every so often, in that one side or the other will not power up. I rang the supplier (Hobzee something or other) as they were not cheapies, and they suggested a bad earth point, but so far have not been able to nail the problem.
So - when working - fabulous, but frustrating when only 1 headlight powers up.

