I too have a vert (68) with rust damage in the same area. Not as extensive, but same area.

Research has found that the quarters will solve the exterior only, the interior (drip rail mounts, vert top mounting area) is not yet available. However, the lower center section is available via Classic Industries. The upper center section (between the trunk and top) is also available at C.I. Basically, we are waiting on someone to produce the lower 'wrap' areas under the quarter sections.