Eight of Harley-Davidson's ten nearest neighbors by audience shape are country musicians and bands — not other auto brands, not motorcycle-adjacent retailers. The scores run in a tight band from 0.87 to 0.86, with no single neighbor pulling away from the rest, which is the defining feature of a flat shape: the audience overlaps broadly across a consistent type rather than concentrating on one anchor.
Kyle Larson (0.87) sits at the top, the one athlete in the set — a NASCAR driver, which places him in the same motorsport-adjacent cultural space as several of the musicians below him. The country contingent runs deep: Kenny Chesney (0.87), Eric Church (0.87), Jake Owen (0.86), Dierks Bentley (0.86), Kip Moore (0.86), Garth Brooks (0.86), Luke Bryan (0.86), and Florida Georgia Line (0.86). The only non-musician, non-athlete entry is Dairy Queen (0.86), a QSR brand. No other Auto brand appears in the top 10.
The pattern is a cross-kind cluster: an Auto brand whose nearest audience shapes belong almost entirely to country musicians, with a motorsport athlete and a fast-food chain rounding out the set. The consistency of the scores across eight country acts suggests the audience overlap is structural rather than incidental to any one artist.