If it is the automatic with the indicator switch attached to the column, then its a plastic pin thats broken. According to the 1968 book the same one number was listed for all models using an automatic with column shift.
p/n 2883 211. If you check a '69 parts book to see if its listed, its in the steering section 19-46-44 as Pin, steering column gear tube switch, w/ auto transmission column shift.

Sometimes they show up. It takes some hunting and asking around.

One guy on FABO used a machine screwas a substitute.
https://www.forabodiesonly.com/mopar/threads/i-need-help-with-the-reverse-lights.292551/