AFAIK, B727 and A300 need a towbar with the pins coming out by the side to attach to the towing lug. Similiar to a 747. A320, B757 and B737 have the bar type connection. Never handled the rest. So, how can all the a/cs have common attachments ?
afaik, the A300 comes in two flavours, the B4 uses the pin type and the -600 uses the bar type.
-Jd