Dunlavy drivers

Does anyone know if you can buy replacement drivers for Dunlavy SC-IVa's? I would assume their drivers were not made in house. I am considering purchasing and just want to be sure I would be safe in a "worst case scenario".
Madisound carries them. See them here....http://www.madisound.com/retrofits.html

I did the same exact thing, but haven't ever used them....FWIW
Perfect, thanks !!!
Enjoy the SCIV-A's, they're special speakers.....