No info about availability.
Quite simply, this module will connect via a 2mm ribbon cable to the PM MKII or Channels MKII, and will provide you with Pre or Post fader outs on 3.5mm jacks.
Choose Pre or Post depending on which header you connect it to.
Module does not require power.
https://wmdevices.com/products/pm-mkii-direct-outs-expansion-8-stereo-channels-pre-or-post
These merchants probably sell this module. Huh?
WMD PM MKII Direct Outs
WMD PM MKII Direct Outs Expansion
WMD PM Direct Outs MKII Performance
WMD PM Direct Outs MKII Performance