The car was seen apparently following Mr Commatteo as he drove his Jaguar away from his premises in Merstham at 6am two or three weeks prior to his murder in March.
Investigations into the registration of a Sierra E301 HPL revealed a Sierra with the same registration was originally owned by a man in the Crystal Palace area.
He subsequently sold it to an Irishman by the name of Peter Doyle in January this year and detectives now want to speak to the current owner or anyone who knows anything about the car's movements.
Anyone with information should telephone the incident room at Horley on 01737 765 040.
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