A vehicle includes a first metallic body panel, second metallic body panel, and spacer. The first metallic body panel is secured to the second metallic body panel. The second metallic body panel is comprised of a dissimilar metal relative to the first metallic body panel. The spacer has a concave peripheral surface. The spacer is disposed between and secured to both the first and second metallic body panels such that the concave peripheral surface is exposed via a gap between the first and second metallic body panels.