This Module is currently available.
Blank/blind panel. To be used for DIY modules and as a safety fill in to a case.
https://www.ctrl-mod.com/collections/blank-blind-panels/products/blank-panel?variant=24894153353
These merchants probably sell this module. Huh?
Instruo Blank Panel - 8HP
Ritual Electronics Blank Panel - 6HP
Instruo Blank Panel - 4HP
Ritual Electronics Blank Panel - 4HP
Instruo Blank Panel - 12HP
MSL Blank Panel 12U White