This item is spare part for the these David Clark Items: H10-00, H10-20, H10-21, H10-26, H10-30, H10-36, H10-76, H3050, H3051, H3330, H3331, H3332, H3335, H4230, H6030, H7030, H7050, H7051, H7130, H8730, 12304G-07, 12304G-08, 12507G-20, 12507G-25,