This item is spare part for the these David Clark Items: H10-13.4, H10-13H, H10-13HX, H10-13N, H10-13S, H10-13X, H10-13X, H10-56HX, H10-66X, H10-76X, H3430, H3432, H8530, H8532, H8535, 12416G-23, 40411G-05, 40493G-01, 40642G-01, 40642G-02, 40659G-0.