And the point goes to Serra for the complete answer. In fact, you included more information than I had, when I posted the puzzle.
I recently tried searching for the Anchor, thinking it was actually a religious cross. Various sources also describe the Bugatti as a Type 29/30.
Your Ballot image has part of the aerodynamic nose removed. In theory, this area contained the spare tire. In practice, the spare was not carried during the race, to save weight.