One tested working 65W Dell Auto-Air AC adapter model DA65SN3-00. Dell P/N DK138.  This includes

1) the power brick

2) Two prong wall AC cable

3) 12v car charger

4) emPower airplane power adapter for the 12v charger

5)  emPower airplane power adapter for the power brick

The DC power side has  a fairly large tip.  My calipers measure it be about 7.4mm outer diameter.  This is missing the DC power cable extender so the cable coming off the power brick is only 14in long.  This is only on the AC side.  The AC power cable is full length.