I know that this is not what you are looking for, but I had a similar problem in my 92 GT as it had an after market sunroof installed in it that was leaking so I had to replace it with a larger roof, and both of them where larger than the stock unit.
The original installer had moved the roof support back behind the sunroof and mounted the dome/map light there which resulted in a terrible looking installation.
When I redid the installation, I completely removed the roof mounted light unit and installed a convertable rearview mirror with the lights built into it, then I installed two footwell lights out of a 66 mustang on the drivers and the passengers side and hooked them all up to a theater dimmer like the new cars have, plenty of light compared to the old installation.
Just FYI