Here's another picture with what looks to be #5 in it, but there's very little information.
The caption reads "Big car racing King Ralph DePalma poses behind the wheel of a miniature Packard Twin Six racer. This is in the Los Angeles area in 1924."
I don't know what the car actually is, but the badge on the radiator, visible in the puzzle picture, does indeed say "Twin Six". The bonnet is painted with "Warner Bros Special", again as in the puzzle pic. The car is obviously registered for road use, but that's all the information there is.