FYI- While you're bolting stuff to the roof inside..... you might also want to look into a late 1990's - 2004 Mustang (and a fre other Fords) dome light. Perfect fit without any trimming. Just un-screw the old Bronco light and screw in the Mustang one. It'll go great with that new OHC.
EDIT: Here's a pic I snagged from Steve and a link to one of many threads that talk about them..