This replacement microphone plug cord is compatible with the following David Clark models:
 
H10-13.4, H10-13H, H10-13HX, H10-13N, H10-13S, H10-13X, H10-13X, H10-13Y, H10-20, H10-21, H10-26, H10-56HX, H10-60, H10-60C, H10-60H, H20-10, H20-10HX, H20-10S, H20-10X, H20-16, H3430, H3432,