Pantera Doug,
I fitted LED rear stop/tail lamps to my 73 Sunbeam Rapier.
Not a Pantera, I know, but the wiring is from the same era and quite similar (a few of the components are exactly the same).
They worked extremely well, improved the light output and reduced the current drain through the switches. But you cannot use these for the flashers as they don't draw enough current for the bimetal flasher unit to work.
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