He means the windows that slide open the opposite side if the slider... I have one but not sure what their name is... rather than the windows that are flaps... again no idea of name haha
http://www.vwbusparts.freeserve.co.uk Try here, my mates got a t25 asked for a few bits and he came back the very next day with price and pics of the items
If you want the silver frame try VWFBI but expect to pay around £150 if you want a new one try custom & commercial - they done me a cracking deal but they could be flooded out at the moment.