Module is available as a DIY project only.
This Module is currently available.
Dual Ring Modulator Model 111 clone.
The La Sesenta y Siete 111, Dual Ring Modulator, Two independent ring modulators. Each output consists of the sums and differences between frequency components of two input signals. Original signals are suppressed about 55 db.
https://modularaddict.com/manufacturer/la-sesenta-y-siete/l67-111-pcbpanel
These merchants probably sell this module. Huh?