This Module is currently available.
4-Channel Mutes with Switches
A simple 4-channel passive mute module with mechanical switches. I/O is bi-directional. This version has a PCB front panel.
6HP, approx. 5/8" or 16mm deep
Handmade in Selden, NY
https://reverb.com/item/36076844-sunbear-modular-4-mute-passive-mutes