Try
www.bulgin.co.uk and go for the General Connectors page
(
http://www.bulgin.co.uk/Products/GenPurpose_Connectors/GenPurpose_Connector…)
Many type on that page but I think you should see what is described towards
the bottm.
Yes, that's the sort of thing. The actual ones used were larger in
diameter than those, and wwre rated at 5A, but those seem to have been
discontinued now.
-tony