This Is The Same Diaphragm Made By Eighteen Sound / 18 Sound For A Replacement For Yorkville Driver 7573 Also Used On Yorkville 7448, 7573, D18C120 High Frequency Driver 8 ohm. Y115 YX10 YX20 NX20 NX25P TC1510 DC18C120 Please Look And Make Sure The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below Voice Coil Diameter : 25.0mm / 0.98" Impedance : 8 Ohm Outer Ring Diameter : ~50mm / 1.96" The Center Distance Of The Two Post Terminals : ~104mm / 4.0"