700E and 773 Parts purchased directly from Lionel some time ago:
690-700E-009 Trailer Truck Rear Wheel - Quantity 4
690-700E-Trailer Truck Pivot Screw - Quantity 2
600-0773-069 Rear Truck Spring - Quantity 4
600-0773-086 Retaining Trailer Truck Stud - Quantity 2
600-0773-087 Drawbar- Quantity 1
P 49