One flasher unit covers all four, but a different flasher is used for the four way emergency lights, so you probably need 2.
On my car (73 Swinger) the signal flasher is just to left of the glove box door, and the E flasher is behind the cluster on the left of the steering column.
Probably round silver canisters on yours.
The electronic flashers work with incandescent lights also, but the main difference they make with incandescent lights is that they don’t flash slower at idle.
Side markers are gone and replaced with reflectors (no lights)
Dash cluster (speedometer)is done with strip light LED’s, and single gauges are done with one LED each.
Brake, turn, tail and emergency flashers are all a replaceable LED panels.
You can see the orange front parking and signals, and red park, signals, brake these pictures.
The centers of all 6 lenses are trimmed out and replaced with smoked Lexan except the backup lights.
Those are done with white privacy film like window tint.
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