Help! Need Advice for mating 64 speedo cable to 71 Trans !

http://www.bperacing.com/speedometer_cables


They show the early screw on and late clip on at the speedo. The pictures do look like the later style has more cable showing on trans end. May call them up to see if they make they're own or maybe they can help you out.

Can you swap the speedo gear housing from the early to the late?