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Specs:

Overall Diameter:  5″ (127 mm)
Voice Coil Diameter:  3″ (76.2 mm) Edgewound
Diaphragm Material: Titanium
Diaphragm Height: 15.2 mm
Nominal Impedance: 8 ohms

Here is a list of the driver part #’s:
DH1A-8, DH1A-MT-8, DH1AMT-8WP, DH2012-8, N/DYM-1-8, N/DYM-1-MT-8, ND6X-6 and many more.