Unfortunately I can not do much more, because the Silent Wing 2 not on my case (Xigmatek Asgard) fit. The dimensions are the same as my standard fans, but you have the 25mm long screws for mounting the housing use (other thread dimensions). the screws can be used with the fan through the Silent-holding system not.
Real bad that I had to return the fan :(
Thank you anyway!
For my personal misfortune BeQuiet can not and that's why I still like to give 5 *