Remove the inside windshield mouldings, defroster vent mouldings, Radio speaker grille, speedometer and gauge cluster (you can just remove the screws and let it hang) remove the dash pad where it clips to the under side of the dash. It most likely will be glued so you will have to scrape it off on the top of the dash. There will be holes left in the under side of the dash where the clips were. You can't hardly see them with the pad off. I'm with SemiCrazy never seen a 300 with a paded dash. Does it have paded visors? Although I have two 63 Galaxies (not 500s) one with a paded dash and one without.