The driver is an MCM 55-1870. The stuff we used on the cones was a butyl/latex mixture that is no longer available, made by Lord Adhesives, a company that makes speaker adhesives. On the frames we used silica loaded latex paint for sealing concrete on the early versions, and 3M aluminum and synthetic rubber constrained layer damping tape on the later versions. I'm afraid I no longer have any of these materials, but you could probably put a coat of shellac on the cone of the stock 55-1870 and it would sound pretty close.
Puzzle Coat or Modge Podge is another readily available (from craft stores) option for treating metal cones (paper for that matter as well) -mix down 50% with water and apply with soft sable paint brush (craft store as well)
For damping frames and magnet covers, Silent Running 500 from Marine or Industrial Paint suppliers is a ceramic doped latex based paint on product that works well, or there's always good old Ideal Duct Seal (commercial electrical or HVAC suppliers)
