Refconverter?

[Kostas Kavoussanakis]

Hi,
I won a refconverter on eBay that does not fit my (post-M, you see) 
bodies. It looks like the refconverter-II on Boj's page with the flat 
rubber top (does the ref-II have colour markings on the ocular?), but 
there is one thing I am unsure of: it seems to have catches at the 
bottom, in order to attach securely to the viewfinder. Can anyone 
confirm the identity of the refconverter?

Thanks,

Kostas