The FrontClick plate can be thread in the old headband. You will need the FrontClick mount to get a working setup.
Compatible older models: Piko (up to 1200 Lumens)
Suitable for new models: up from 7W Neo 700 Lumens, up from 15W Piko 1500 Lumens ( with and without Bluetooth), 22W Blika 2100 Lumens ( with and without Bluetooth)