94 mustang gt sun visors.

I had my sun visors reupholstered on my 94 mustang gt convertible. I cannot for the life of me figure out how to reinstall then. On most every other vehicle, the install is simple...2-3 screws and you're done. Anyone know what trick there is to installing these? Mine have the courtesy lights. (which the upholstery shop cut the wires to.)

Thanks