I think im asking a fair trade, what do u think?

Id be giving up Rafeal Furcal, and be getting Mariano Rivera. I have a shortstop already in Jimmy Rollins, but i only hav Joe borowski as a closer. The guy has 4 closers but his short stops are Rich Aurilia and Bobby Crosby. I think this trade helps both of us right? Am i doing the right thing?