The original Reachy used Raspberry PI cameras with an Arducam multiplexer and using an I2C switch. Version 1.3.0 of the Reachy software migrated from that setup to using Logitech C270 USB cameras.
Their more recent OnShape files also have brackets that fit the newer cameras. As seen in the below picture from Pollen, the boards are removed from the webcams and put into the brackets.
Small (Amir) lens
1 - Amir lens
1 - Amir lens body
1 - small bracket to hold small lens and webcam board
screws and inserts to attach bracket to head front
Large (Aukey) lens
1 - Aukey lens
1 - Aukey lens body
1 - large bracket to hold large lens and webcam board
screws and inserts to attach bracket to head front
2 USB camera boards
USB hub (need to verify)