Anyone else own Flatline 175 ribbon speakers?

I don't own a pair but a dealer near me (Wilson Audio of New Orleans) almost always has used pairs available in his store. I think they are a great speaker and still hold their own decades later. Just listened to a pair against the Magnepan 1.6QR & 20.1. I'm surprised they've held up so well for Wilson's many clients that have bought and traded them back in over the years. It was in Stereophile's Class B recommended components back in 1994. It's a greatly overlooked speaker design, one of the few that sounds quick like a planar speaker but smooth on the top & still dynamic in the bottom. The different drives types merge together seamlessly. Martin Logan should take a page from the FlatLine Design Notebook. ML never effectively integrated a dynamic driver with their electrostatic panels.

I think it uses the Bohlender Graebener RD75 Planar Transducer that is still available at Parts Express.

I've owned my pair of FlatLine Design speakers since 1993. However, I recently blew out the midrange and woofers. This is the second go-round of replacing these drivers. The first time, I replaced the woofer with 10" Scanspeaks and Peerless 6" midranges. Great sound! The Scanspeak models previously used have been discontinued.The peerless may have been discontinued as well, but I'm mostly concerned with the woofer replacement. The closest Scanspeak model is rated as an 8 ohm with a power handling rating of 100W. Can anyone help me with replacement drivers?

I just acquired a pair SN 1021.  Would love to know more.