The shooters were Sunil and Purushottam alias Monu, police said.
"We recovered a Skoda car which was used by the duo during the incident. It was recovered from outer Delhi yesterday (Thursday)," a police officer told IANS.
He added that the car owner, Rakesh, has been taken into police custody. The car has been impounded.
"During interrogation Rakesh said that he got Rs.8 lakh from Sunil to buy a car. Rakesh also identified both the shooters from the CCTV footage," police said.
"No arrests have been made so far," the officer added.
Bharadwaj, the richest candidate in the 2009 Lok Sabha polls from Delhi with declared assets of over Rs.600 crore, was shot dead March 26 around 9 a.m. by unidentified men in his south Delhi's 35-acre farmhouse in Rajokri.
The two suspected killers and an accomplice fled in a Skoda that sported a fake registration number.
A post-mortem examination report revealed Bharadwaj had been shot in his head and chest.
The killers entered the farmhouse on the pretext of meeting Bharadwaj to book a marriage venue in the farmhouse complex.