I'd like to install some new lights in the front headliner, but I don't want to take it down unless I know what I want to put there will fit. I imagine that there is the most room in the center, and less room as you go out towards the edges. The light I want to put in is about 1 1/2" deep, but I want to leave some room for wires. Could someone please describe to me how much room I have to work with?

Thanks,
Ed in CT