X-Pro1 - bigger rubber eyecup ?

[panocanarias]

Hi all,
since two weeks I can play with my new toy. :-)

I already ordered a Cosina-Diopter lens (still waiting..).
Now I'm looking for a bigger rubber eyecup, too.

Anyone tried to attach one ?
Will Nikon DK-2 or DK-3 fit ?
Anything else needed to mount it ?

Thankful for any advice :-)
Salu2