FED 100mm viewfinder

Hi, I'm looking for the 100mm viewfinder from FED, to accompany a 100mm 6.3 lens I will be receiving shortly. I'm in no big hurry, I purchased a Canon 100mm finder that will do fine (even looks the real deal!) but an original finder would be nice.

It looks like this (Photo from Aidas, borrowed it):



Anyone that can help me? Have one for sale yourself? Know where one is on sale? Please PM or email me!

Cheers,
Johan