This Module is currently available.
MG ID: 9691
Headphone Monitoring Amplifier 500 Series module
500 Series double-slot module headphone monitoring amplifier with Phonitor Matrix for two headphones.
https://spl.info/en/products/3338/hpm/overview.html
These merchants probably sell this module. Huh?
Included in 31 Racks, 19 are public:
How much is the fish?