go to the Dayton RS28A-4 tab
Seems to be an Usher 9950 assembly with a Scan Speak 9800-like dome and an extra outside Faraday shielding ring in addition to the inside ring. Takes the fun out of driver-diy, because I was just developming ideas for my own perfect tweeter motor.
I would not be surprised to find that the dome is exactly the Scan Speak dome. Scan buys from Dr. Kurt Müller in Krefeld, one of the largest manufacturers of loudspeaker moving parts outside of China. Many of their OEM developments seem to be widely available now, such as the carbon paper cones and funny wide surrounds used on the 8535, 8545 and 8555.
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