The first production A4D Skyhawks carried two 150-gallon external tanks. These were soon superseded by 300-gallon tanks for additional range. At some point, the original pylons were replaced by longer ones.
Original:
Longer:
The later wing pylons were increased in length by 10 inches, all added at the aft end. In other words, the leading edge of the pylon remained just aft of the slat and the lugs/sway braces were in the same location under the wing. Note that the 300-gallon tank could be loaded on the early pylon. It appears that the additional length may have been necessary for compatibility with the multiple ejector rack.
Bill Larkins Photo
For better illustration of the external tanks:
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