Turn signal and tail lights (2 Q's)

I've got two questions:

1. My 69 Dart does not cancel the turn signals when I straighten the wheel out. It holds it on fine in either direction, but I don't hear a click or anything as I make the turn to allow for canceling it. Is the mechanism broken or was canceling not standard then and that's why I have fender mounted signals to remind me?

2. Will 68 Dart tail lights/housings fit my 69 body?

Thanks,
Nate