I have been doing a little research on this, and it seems that the dash control parts are the same, and it is only the mounting housing (3783061) that changes from 1962 to 1963 cruise units. My biggest problem is that I can't find many of the parts listed in the parts book to know for certain. I did find that the "brain" externally is the same, however, GM made changes internally to the brain in 1963 from the 1962 brain, as well as the dash control. I don't see this as being a problem overall, since everything seems to be the same when I compare the 1962 installation instructions to the 1963 installation instructions.. One of the reason that I am researching this, is because I have located a complete NOS 1963 cruise control unit. It is part number 985524. I have yet to find this part number in any of my parts books or online. There is a label on the top of the box that says "demonstration unit". I am thinking that this might be a specially assigned part number, which might have corresponded to a special discount when it was installed on a "demo" car? If I could find someone that has a complete NOS 1962 unit, and would like to trade for this complete 1963 unit, that would be great. If not, then I will continue to look for another NOS 1962 unit.