1965 Dodge Dart front blinkers and turn signal switch.

Although I am self-interested in saying so, it remains true: you can throw endless money and time (and knuckle-blood) at poor-quality Chinese switches that can sorta be made to fit and mostly work until they break...or you can buy the good, correct switch and do the job once and correctly.

As for cruddy old sockets and related faults: repair information is here.