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I installed led bulbs in the rear on my '75, now I know that I need to replace the flasher to an electronic one and indeed the turn signals don't blink but stay on.
Now I want to replace the flasher but there is like another resistor with it, do I replace both of these with the flasher I have ?
throw away everything , that is old capacitor. no longer needed. with today's radios.
that capacitor is a 50 year old style wax Paper capacitor, when this shorts out it burns,
and catches fire the paper ! ( ..and they fail with age).
I would suggest remove all of these from the vehicle.