You really need to supply other information - such as :-
What are your dimension limits
not bigger than about 1cm
Does it need to be any special shape
Not really but round shaped connectors are easier to install on panels
Does “5-6” mean 5 or does it mean 6
6 preferable (future proof) but 5 is also ok.
Does it have to be detachable
Not sure what the you mean here. Obviously I need a panel mounted receptacle and a matching plug that will be installed at the end of a cable.
Does it have to be anchored (secure) when in place
Not in the sense of screw plug like an aviation connector has.
What is the voltage and current rating
5v, 200mA max
Why does it have to be so small
Because the actual space available in small. It is intended for installation on a din rail mounted box where other indicators/ controls are also present.