When I worked for Paul Gottschalk years ago, we supplied Player Piano
Co. with their soft rubber Ampico motor mounts.  We literally made them
in the kitchen by heating the white rubber pellets in the oven and
pouring the rubber into heavy aluminum molds.  I'm sure Paul still has
the molds and may consider making a set.

You can contact him at:

    Gottschalk Music Company
    208 South First St.
    Champaign, IL 61820
    217-351-1099

Bruce Newman