Here are some dimensional drawings of the 1961 Tower speaker with the spike kit mounted.
The length of the Spike bar is 25cm.
The distance between the centre of the spike bars is 22,56cm.
The distance from front and back of cabinet to the spike bar is 1,7514cm.
The distance between the grille and the spike bar is 4,083cm.
The spike bar width is 2,5cm.
