voltage regulator
The part no. if you can find them is Standard Blue Streak VR-128 or Echlin VR1001, looks like this, hooks up the same as the "up through 69" VR
Another good way to go is to buy a "square back" (73 and later) so called "dual field" (incorrect term, they are "isolated field") and then add just one more wire to use the newer 70--and later VR
Looks like this.........and mounts link your old one.......