Boy -- there are bike nerds around. Back in college (very early 80's) ... I was planning a trip to France -- was working through a local bike store to get a 720/728 made up for the trip. I did not like the top tube cable ... it's been so long I can't remember if they had time to send me one of the ones on the bottom or not. Talked to the factory about it ... They did them in batches based on models and size.