Just seen this on Ebay from VWH. I can't work out where it would go on a T4 engine. Could it be that l am looking at it from the wrong angle?? http://www.ebay.co.uk/itm/VW-T2-BAY-WINDOW-1700-2000CC-COVER-PLATE-HEAD-FAN-/160641644022?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2566fcf5f6#ht_704wt_1165
Its definately of a type 4, i beleive it fits underneath and provides the fixing for the two bottom plates. The curved part slots between the cylinder heads. Im sure someone will have a more accurate description.
Cheers. I can see it now. I was looking at the wrote angle. The thermostat gave it away. It just looked really strange.