Seek Standard pedal frame and bass side brace, see photos.  The
pedal frame and rod are un-repairable.  The Standard Pneumatic
Action is from 1913.  Inside measurements of the pedal frame are
9-7/8 x 4-3/4.  Would consider a complete pedal set.

Walt Gerber - The Antique Piano Shop

 [ Standard Pedal Brace, Bass Side Broken
 [ http://www.mmdigest.com/Attachments/16/10/27/161027_124621_IMG_2279.JPG 
 [ Standard Pedal Frame, Bass Side Broken
 [ http://www.mmdigest.com/Attachments/16/10/27/161027_124621_IMG_2278.JPG