Wiper notes: Our '72 L came with the dual plated wire blade-holders that were also used on late '60s Jaguars. The arms that pivot on the protruding stubs were Trico which may be U.S-made (Ford). The serrated stub size seems to be standard for many cars around the world including U.S-made GMs.
Many Pantera owners carry the wiper arms & blades loose in the front trunk. One Nor-Cal owner who drives "vigorously" once had an electrical fire when a loose wiper bounced up and shorted across the stock-mounted battery posts! There was some hood damage and it melted part of the battery case, which leaked acid. If you carry the wipers in the trunk, I suggest cloth-bagging them, or drop the battery down in the front trunk ala post-'80s Panteras, with a cover over the terminals.
Back in the day, wipers were well known to lift off the glass at speeds above about 125 mph and tear off, which may have led to storing them in the front trunk in dry locales. The Euro-Pantera Gr-3 Catalogue lists small sheet metal clip-on blades that hand-slide onto stock lower wiper arms and act as 'wings' to prevent wiper lift. Hall used to sell them but I've never seen a pair except the ones on our car (tested to 150 mph).