Contact Bob Reimer at Creative Sound to ascertain whether he can supply all of the parts required for the Beta LS.
The original design used the CSS WR125 midwoofer but the CSS FR125S will sub directly for the WR's. Aurum Cantus has changed some of their ribbon designs recently but I suspect that the ribbon tweeter used in my design is still available. Bottom line is very nice sound. I still use my pair daily.