Two members of the rap group “2 Pac” were arrested Saturday for allegedly assaulting a driver who protested their use of drugs in a limousine, police said.Tupac Shakur, 21, of Newhall and Charles Fuller, 23, of Richmond were arrested for investigation of assault with a deadly weapon, said Sgt. John Zrofsky. They were being held Saturday on $ 15,000 bail each. The driver, who did not want his name released, suffered cuts and bruises during the incident in Hollywood. He was treated at the scene but refused to be taken to a hospital, Zrofsky said.