Ok, I understand. I think that is all I need to know to make something myself without initial measurements. The linkage has some available travel "forwards" (i.e. up) while it's disconnected like this, so I assume the spring in the diagram is to pull it fully upwards at closed throttle. Then the rod can push it down/backwards throughout the throttle travel.
I guess then, the length of the rod should be whatever the distance is between the two mounting points when the TV/kickdown linkage is fully forward, correct? Thanks.