https://omny.fm/shows/beyond-the-bricks/jake-and-mike-discuss-some-indy-500-one-hit-wonder
On Beyond The Bricks, Jake Query and Mike Thomsen talk about some of the drivers who made one appearance in the Indianapolis 500, for a variety of reasons. They pay tribute to drivers like Dave MacDonald, who died during the 1964 500, but had a very successful career elsewhere before his one Indy 500.
Jake and Mike talk about Sam Posey, who made just one start at Indy, but became well-known as a TV analyst on ABC. Other drivers include Hector Rebaque, Jacques Villeneuve (uncle of the eventual winner), and Randy Lanier, who funded his racing career in a not-so-legal manner.