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AH HA! While preparing to upload some new TMs I found that TM 11-5830-340-30 is available in the Technical Manual section - it should answer all of your questions about the intercom components and installation.
Re-reading your original note I see that you want to install an intercom kit in an M109.
Check TM 11-5820-401-20-2 it shows the components and installation of the AN/VIC-1 intercom setup. This is primarily intended for use in tracked vehicles so it isn't addressed in the TM for wheeled...
RE: Nope
What you have there:
INSTL KIT: MK-1967/VRC F/KY-57/W AUXILARY RECEIVER R442
Is the installation kit for the KY-57 (which you can't own) for use with the Auxilary Receiver R442. The reference for the KY-57 install kits is SB 11-700, which is available at LOGSA, but you can't download...