I have recently put new LEDs in my 65 - http://www2.cougarpartscatalog.com/plasma2.html
. This after trying some other cheaper LEDs to get the brightness up to modern standards...
Here's a pic of "old" LED tech next to new. Gecko poo for size comparison:
And lights on (soft red glow) - old LED:
Lights on (soft red glow) - new LED:
And brakes on (or flasher, same intensity) - new LED:
Can't complain about not seeing that!
Because the lights function as indicators as well, a standard thermal flasher can won't work anymore as the current draw from the LEDs isn't enough to activate the clicky-clicky inside it. The solution is a different flasher can, available just about anywhere for $15 or so. Just make sure it's an electronic flasher can, rather than the old thermal type. Plugs right in.
EDIT - to that last point, I changed the flasher can on my car because the older LED bulbs wouldn't work with the flashing turn signal - you might be OK with these new ones. I never tried the old thermal flasher can on the new LEDs as I had already replaced the flasher can after the first conversion. But yeah, they're less than $30, and they are MUCH brighter than stock incandescents...