David Clark Boom Attachment Kit | 12840G-08
For the these David Clark Headsets:
H10-13.4, H10-13H, H10-13N, H10-13S, H10-13Y, H10-20, H10-21, H10-26, H3430, H3432, H3492, H4230, H6030, H8530, H8590, 40411G-05, 40493G-01, 40523G-01, 40642G-01, 40642G-02, 40665G-02, 40683G