Reaction of CpFe(CO)2Cl with phenyllithium
http://voh.chem.ucla.edu/vohtar/fall06/classes/277/pdf/18-Electron%20Rule.pdf 
Summing ligand electron contribution. 
DOI:10.1006/jmsp.2001.8470 
http://www.ccp14.ac.uk/ccp/web-mirrors/farrugia/~louis/chem2x/Organomet-2.pdf 
 Document p. 34.  Note error in drawing the graphic.

Direct displacement gives $\ce{CpFe(CO)2Ph}$, with the phenyl being a simple anion sigma-bonded to the metal. If there are two carbons plus two oxygens in the product, implying the CO ligands are intact, your are done.  If some fancy stiff happened with those ligands and the phenyl anion, you must work it out or look it up.