Hi All, Interesting discussion and it seems only a little confusing however I'm in agreement with Gernold and Achim. In my case the material on the horizontal, windshield header (frame) is MB Tex matching the color and texture (grain) of the rest of my car's interior.
Norm's fine pictures show a color, I'm calling cream (the car's interior color), fixed to the horizontal windshield header that the rear view mirror and other roof hardware are attached. This cream colored material, MB Tex or leather, is also found on the A pillar covers, same as mine. The material I'm calling beige, fixed to Norm's soft top frame, at the windshield header, appears to be the same color and material as on my ST frame. This material is like my MB Tex in texture.
As Achim indicates my MB Tex is glued to the windshield header but only at or under the chrome molding(s) at the top and under the windshield seal at the bottom; there may be a thin foam backing because there seems to be a slight cushion when the Tex is pressed against the metal header. It may be like the thin foam backing on my B pillar MB Tex which is original and degrading (turning to dust).
Unfortunately I've not yet found a source for the earlier, fine grained textured MB Tex that my car interior has or the material found on the ST frame. I have not perused this site to see what others may have found; a link would be appreciated if someone has found a source.
Bob