Schofields do 2 different types, that 3 piece on that VWH sell is a schofield one, but schofields are a bit cheaper, or they do the top part of the front panel, if the rust is only where the seal sits then that 3 piece version will be good for you.
http://alanhschofield.com/ourparts/prod_2632910-Windscreen-Repair-Panels-3Piece-6879-211805130.html" onclick="window.open(this.href);return false;
They do one which comes down to the grille for about £140.00 but i cant find that on their site.