This is the part number, 156-82540-00
It was used on a lot of yams of the period, 1964 yds3, 1965 yds3, yds3c, ym1, 1966 yds3, yds3c, ym1s, 1967 yds5e, 1969 ds6c, 1970 ds6b, could well be more.
Looks like you might need to get one from the states looking at ebay, fowlers might be able to do something. They do seem to be able to pull stuff out of the bag, sometimes just speaking to one of their guys on the phone can get you what you need. Has worked for me in the past.