Audio Physic Avanti II Hochtoner/Caldera?

Dear Friends,
I need to use englisch as my level of written German would be too weak for this professional forum.
I'm looking for help with partly dead tweeter from AP Avanti II.
It is not completely dead but with a lot of cracking noise.

I would like to exchange a pair of tweeters but there is no info from Seas provided for producer-ordered components.

The old tweeter is Seas 25 TAFC/GW-APH H 864 - 6 Ohm.
Surprisingly it's same tweeter as used for Tempo I and II....

I'm looking for a replacement or a tweeter similar to the one used in Calderas, which was also applied to Avanti III.

Please reply with German as I read it well.
I would appreciate any help as I have no more ideas where to check for solution. Thank you in advance.