[R-390] Need C-974/FRR-33 selection console

[Phil]

I know this is a long shot for sure but I am looking
for the C-974 selection console.  It is part of the
FRR-33 diversity receiver setup.

This setup consists of a CU-286 antenna coupler
(preselector), two R-391 receivers, the selection console,
a remote selection console, a power supply for the
autotune motors, and a afsk device to keep things in
sync.

I recently got the CU-286 coupler and the remote console
when I bought an R-391 locally.  I have fond hopes of
getting the auto selection part of it working....that is
selecting the channel of the R-391 and tuning the antenna
coupler.  Unfortunately, the remote coupler I have only
attaches to the C-974 so that is the missing piece I need
as I believe I can fabricate cables.

In case anyone wants to see this in action, there is a
20 second video on YouTube than can be found by searching
for FRR-33.

Any help or leads greatly appreciated.

thanks, 73, Phil  W5BVB