I agree the rod should be there, but not so sure that the early rod will work (assuming you mean it's from a TR3 with front drum brakes). There is a different rod listed for the Lockheed slave, and they aren't shown as interchangeable.
And I vaguely recall that when I tried to put a Girling slave on a previous TR3 with Lockheed hydraulics, that I had to swap the support rod as well.