[HBR] Socket for BC-453 IF transformers?

[shoppa_hbr at trailing-edge.com]

The IF transformers in a BC-453 have 4 or 6 female pins on the bottom,
and they mate with chassis-mount plugs that have 4 or 6 male pins.

Is there an "obvious" way to find/fabricate new chassis mount plugs?

Off the top of my head I'm thinking about a PC board with 4 or 6 keystone
(or maybe even Molex) pins in a matching pattern.

The BC-453 chassis-mount plugs seem to be very securely mounted to
the chassis (somehow integrated to lips stamped in the sheet metal?
It doesn't look like there's a lot holding them in but there must be
a lot?) The material is semi-transparent and may even be mica? It's
a fabrication technique that I'm obviously not familiar with and if
anyone cares to educate me, I'll gladly listen!

The symmetry of the chassis sort of has me in a trance-like awe at
the moment. The beauty has me convinced that it's some piece of
alien technology - the 3x3 grid of plugs/sockets, the terminal strips
with resistors in a square rotated 45 degrees at the center, the
metal-can caps in a regular array around the edges, it's a masterpiece!

And all those 3-48 screws!

How many command sets were made? Any history of the plants that made them?

Tim.