told The Post, "I've never before spoken on this issue and I never will again . . . but I can assure [you] the David is not David Geffen . . . a really good guy." Simon revealed the vain one's name to Ebersol in 2003 after he bid $50,000 for the answer at a charity auction. He's a friend of Simon and said at the time he made the winning bid "to make sure Carly didn't have to tell a total stranger."