Bottom is a pivot point both sides. On my 1970 Fury the bolts were 5/16" thread with 1/2" head.
At the top, screws at both ends of each defroster vent, 4 screws total, came out and installed with 5/16" short socket, 1/4" swivel, 1/4" extensions and 1/4" ratchet. Don't know the size of the screws.