Unfortunately, the A50 Mod Kit is not included:

https://www.astrogaming.com/headsets...
https://www.astrogaming.com/accessorie...

Here you are at the community where users answer other users. Please contact customer service directly to find out whether this item can be ordered from Digitec-Galaxus:

galaxus@galaxus.ch
+41 44 575 98 00
Monday - Friday:
09:00 - 18:00