Just to add to the confusion - there are two conflicting datasheets for the Deltron 592-0401 ...
The one on the Farnell site is dated 1995 and shows the 'square' layout.
http://www.farnell.com/datasheets/59...226.1578649018
The one on the Deltron site is dated 2018 and shows the 'trapezoidal' layout (as per the Farnell image).
https://www.dem-uk.com/deltron-compo...-plug-data.pdf
Cheers