I recently bought all of them. The full cowls appear to be 20 gauge and I believe that the originals were 19 gauge. The inner to outers are pretty stout, mine were gray in color. The newer rocker panels are thinner that the older replacements but they have the proper bends at the ends. The newer ones are finished in black. The old style were just one long piece of the same contour and they were of heavy gauge. Since they didn't have the bends at the ends, the inner to outer cowl piece did not fit properly. It appears to me that the new style of rockers do not strictly duplicate the exact contour of the originals. They have a deeper contour, probably to add strength with the thinner gauge.
The old floor boards and separate toe board were of a fairly heavy gauge. The originals I believe were 16 gauge. the new style has a left and right toe board/floor board combined and they are of a thinner gauge.
