some little differences with the sf grit spreader interior cab. i believe it also comes with low stud and wheel brace and also high stud no wheel brace.
http://img86.imageshack.us/img86/8379/gritspreader70sfcabyn5.jpg
http://img479.imageshack.us/img479/3507/gritspreader70sfcab2bd2.jpg
a little difference that also appears on the rw version. smooth bottom chute and a little raised part on the chute.
http://img151.imageshack.us/img151/3084/gritspreader70sfchutezk0.jpg