The “bushings’ are more like rubber collars that cushion the coupling of the T-T and the geared stem driving it. You can just barely see them looking at the rear of the T-T on the right.
I forgot to mention that by your model, I believe Seeburg was omitting the rubber support plug under the motor. This allows the motor mounts to sag with the weight of the motor. Eventually, the motor rests against the casting protrusion where the rubber would have been and added vibration occurs.
The plug is now available. Years ago I used to just cut a small piece of rubber padding about 1/4th in thick and stuff it under the motor between it and the support.
RobNYC