On my 74 Dart Sport, the turn signal relay is to the right of the ash tray and to the left of the glovebox. Reach up under the bottom of the dash and feel for the wiring. You'll find the cylindrical relay.
The emergency flasher relay should be under the dash on the driver side just to the right of the steering column. It is also cylindrical and also has two prongs that plug into the connector. You may have to get upside down and look/feel around to find it.