This Pedal is currently available.
MG ID: 16537
4-Button Footswitch for Mustang amps
https://shop.fender.com/en-US/parts/amp-parts/footswitches/4-button-footswitch-mustang-series-amplifiers/0080996000.html
These merchants probably sell this module. Huh?
Included in 8 Pedalboards, 3 are public:
How much is the fish?