These are replacement keys for the CX3 early but they will also fit the models shown below. You must select the key you need from the drop down list. Exact color match with your current keys can not be guaranteed.
Korg BX-3 (1980) Korg CX-3 early Korg Delta Korg Lambda (ES-50) Korg Trident Akai AX-73 Oberheim Matrix-6 Oberheim Matrix-12 Oberheim XK