1piece replacement Diaphragm For BMS 4538 8ohm Aft Diaphragm - Fits Many Models

1pcs

Outside Diameter: 2.75" (69.85mm)
Voice Coil Diameter:  1.5" (38mm) 
Nominal Impedance:  8 ohms
Dome Material: Titanium
Voice Coil: Aluminum Wire

Here is a list of the driver part #'s:
4538 j b l 2406 and more.