Two that I have used with good results are “Triad TY-304P” and “Etal P-3356”.  
These are quality 
transformers and are readily available.  Just enter the part number in your 
search engine.

Radio Shack also has several available that should work just fine. 

Just a note:   A transformer is not required for interfacing to a K3 Line 
in/out.  Transformer
isolation is supplied internally.
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