Fit depends more on lug-to-lug and curvature than diameter. As a rule, mid-size tonneau cases wear larger than round ones of the same width.

Usually not. Many tonneau cases use curved end links or custom spring-bar geometry; mixing across shapes often leaves gaps or stress points.

They typically use flat or slightly curved sapphire; avoid lateral shocks, as corner impacts concentrate force more than on round crystals.

Standard lengths (about 115/75 mm) fit ~16–18.5 cm wrists. Below 16 cm or above 19 cm consider short/long options for better buckle placement.