Hi All,  The company that bought all of the parts Kimball had when
it stopped making player pianos is Dancing Ivories in Long Island,
New York:

  Phone: 631-242-0963, fax: 631-242-0967 (Kimball Parts)
  Email: dancingivories@erols.com

Regarding the relays, I have replaced them in the Model E and Model F
with inexpensive 12 VDC relays from Radio Shack.  As they are not
pinned exactly the same as the Mexican ones that Kimball used, you do
have to use jumper wires to connect the relay to the circuit board.

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