After looking at quite a number of pictures of both grand and upright
motors and mounts designed by Ampico, I recalled the one I have in
my Chickering, with top-loading Ampico, which is quite different.
Below are links to pictures of the motor and mount.

  http://www.playerpianosupplies.com/ampico/chickering-motor-1.jpg
 
  http://www.playerpianosupplies.com/ampico/chickering-motor-2.jpg
 
  http://www.playerpianosupplies.com/ampico/chickering-motor-3.jpg
 

It makes me think that Ampico wasn't satisfied with the quietness
of any of their previous motor mounts so they designed another one.
I can't explain why it works so well at dampening the vibration noise
of the motor, but it sure works great!

Musically,
John A Tuttle
Player-Care.com
Brick, New Jersey, USA