http://www.cme.com/clr/clring/sfpcodes3683.html
This website page lists (a)the generic specifications for both the equities and narrow-based indices on OneChicago futures, (b) the ticker code for the equities, (c) the full up-to-six-byte OneChicago product symbol for the futures, and (d) the two-byte CME clearing code for the futures, use in the SPANĀ® file, TREX messages, etc.
Details on the contract can be found on the Contract Specifications pages at: http://www.cme.com/clr/contract_specifications.html