I have one available for sale. (I use the 45 degree finder on my 66).
I also have a very good 6 body available. I bought a 66 and have kept the 6 as a backup camera. (I was thinking of selling it, but haven't...... as I think most people would want a camera with lens and not just the body and finder)
The finder would be $ 40.00 plus shipping. Or the Kowa 6 body and finder @150.00 plus shipping. I can send photos if you are interested