Ohps... I have clicked on the wrong "Atlanta" on Navsource.
Not CL-51 (two shafts). it's CL-104 (four shafts) of course,
but I cannot find any information about a sonar fitting to her.
The underwater hull is not more the problem - but a sonar??
http://www.navsource.org/archives/04/104/04104.htm