Drivers for Fourier 1 Speakers?

I'm picking up a pair of Fourier 1 speakers. One needs a new driver. Does anyone know where I can find technical data on the original drivers, so as to obtain a fairly good match to the originals?
FWIW, I managed to find drop-in replacements for the Audax tweeters, and had the original mids and woofers refoamed. These are lovely speakers.