Module is a 1U tile in Intellijel format
This Module is currently available.
Atlantix Expander
The Atlx 1U expander provides 16 additional jacks to the Atlantix, including: dedicated waveform outputs for A and B oscillators, filter outputs, and a ring modulator. Atlx 1U adds many new possibilities for self-patching, advanced routing, and connections to other modules. The Atlx 1U is identical to the functionality and features of the 3U version.
These merchants probably sell this module. Huh?