Electro Voice (EV) & University Driver and Cabinet Models: Sentry 100A, Sentry 100EL, Sentry 500, Sentry 505, TS12-2, 100S, CD35, CD35 1, CM12-2, CX100, EJ2, EM12CX, FM12C, FR10-2B, FR10-2B-16, FR12-2, FR12-2B, MS802, Musicaster 100, Musicaster 100G, PI100, 81227, 89545, 81155, 81217, 89478, 84478, 81376. Tapco, Entertainer, F01U110857, Interface, 89476, and many more!
Some older versions use a wax-like plastic spacer ring that may be deteriorated when you remove the old diaphragm. In this case, you can substitute .25" wide foam weatherstrip tape to replace the old trim ring.