B&W ZZ11770 Tweeter for Nautilus Series - Speaker Exchange
Amazon.com: Bowers & Wilkins M-1 Satellite Speaker - 4" Glass Fiber Midrange, 1" Aluminum Dome Tweeter, Use as Stereo Speakers or Center Channel in Your Surround Sound System, Matte Black (Single) :
Titanium Dome Diaphragm Fit For B & W NSCM1 Tweeter ZZ11770 26mm VCL 8Ω | eBay