Based on research by Boston photographer Eric Schmiedl
All connectors are made by Fischer Connectors.
panel mount jack -- D105A039-60
cable mount plug -- S105A039-60/9.7UI
cable mount jack -- K105A039-60/9.7UI
cable mount jack, for use with stax extension cables (smaller cable orifice) -- K105A039-60/8.0UI
Call 1-800-777-9123, ask for Glen McCray. Tell him you know me.
HE90 pinout should be determined each time from a set of HE90s using color code here:
http://www.audiogeek.net/files/he90.pdf
but if you don't have one:
clockwise from top, starting to the right of the marker:
(this is viewed from the inside-the-case end of the jack)
red grn blk blu yel
And according to the PDF I have, those are:
right system (+) red
left system (+) yellow
right system (–) green
left system (–) blue
bias black