* Change 2 Part Black {6628 Technic, Pin with Friction Ridges and Tow Ball (Undetermined Type) to 6628a Technic, Pin with Friction Ridges and Tow Ball with Round Pin Hole}
* Change 6 Part Red {6628 Technic, Pin with Friction Ridges and Tow Ball (Undetermined Type) to 6628a Technic, Pin with Friction Ridges and Tow Ball with Round Pin Hole}
Comments from Submitter:
As in LEGO inventory, seems right for the period of this set.