Can't help with length. The intermediate cable for the 72 Duster/Demon is different from the Scamp/Swinger due to different wheel base. So figure the one you need is the shorter of the two A-body cables. The correct cable originally carried part number 3467 906. This appears to be a running change as models made before 11/15/71 don't use this cable. The 73 uses the same cable as the 72 models made after 11/15/71. Hope this helps.