Tweeters for ASW Cantius 504 ( german loudspeakers)

Hi, everyone ! Does anyone know what tweeters does ASW Lautsprecher ( Germany) use in Cantius 504 ? Model? Manufacturer?  The same tweeter we can find in ASW Cantius 204. I'm trying to find a replacement for them, but I didn't find any info and specs.  The diameter of the tweeter with a soft fabric dome is slightly larger than the standard (30 mm), and it starts to work from 2000 Hz t0 25 000 Hz. Some reviews here http://www.hifi-review.com/151459-asw-cantius-504.html
http://www.hifi-review.com/151301-asw-cantius-204.html