I have started this thread in hopes to generate a repository of the differences in choke knobs that were used through the years. Not including the throttle control that is discussed in a different thread. Choke knobs only. Why are 70-71 knobs only available and not 72-73? What are the differences and what have 72-73 owners done to replace theirs? Nissan parts numbers and pictures of the knobs (front and side to display curvature and screw location) will help with this thread.