Reply to Sennheiser HD25 Parts - Where to get?

I have been using my HD25 II's for just under two years now but i noticed today that there is a slight split just away from the ear pad on the plastic cup. It is just a small split but enough that will probably grow even though it's small just now but after looking on the Sennheiser web page, Amazon, eBay and Google etc i can't seem to find just the outer cup..

The only thing i can find is this:

http://spares.sennheiser.co.uk/pro-a...es-040178.html

Now if i have to buy the whole lot i will buy it but my question is, does anyone know where i can buy just the outer case? That's all i need..