Turn signal cam

Down here in New Zealand a parts supplier sells these 1967-74 Mopar A / B / E-Body Turn Signal Cancel Cam at Muscle Car Parts NZ

According to them they fit many models
Yet for my 68 Dart Dorman make #49305 and for my 70 B body Dorman make #49301
What are the members experience? I'm going to be needing one for each vehicle