Upon receipt of part (in 2 days), removed right panel (snapped on). Removed ice tray. Removed one screw holding broken tray. Then removed plug from motor/solenoid.
Next, moved motor/solenoid from old cracked tray to new one. All holes aligned exactly.
Replaced shelf/motor in freezer, and reconnected cable from motor to freezer wall. Put one screw back in. Then replaced right-side snap-in panel. Finally, slid in ice-tray itself onto the new shelf. Tested okay.