Economite Model E20

A friend has the above gas conversion burner in their Peerless H/W boiler. Budget does not allow for a new boiler or new gun. The issue is that the cage blower makes noise which is a result of the rubber mounts holding the motor to the frame failing. It seems like a relatively simple thing to fix if the parts are available but is not a high priority with their heating people. Does anyone know where I could get these parts? System functions fine but is a failure waiting to happen. I know they made thousands of these so I'm hoping there is a supply somewhere. Thanks.