Yet another really interesting article from 82games.com.
For a 5+ year period starting with the 03-04 season, Ben is tied for 7th with 12 total "game winning" shots, which is defined as last 24 seconds, team is tied or down 1 or 2 points. He's made 12/34 of those for a .353 shooting percentage. Apparently he also has 1 game winning assist and 4 TOs in that scenario.
Ben was among the top 5 in 04-05 (4/7) and in 06-07 (5/14), but not in the top 5 his other years in the league. I didn't see any other Bulls on the lists.