After some group activity on the Large Format Forum, and undertakings to purchase Fotoman is working on 5x7 holders, to be ready "mid summer"
Calumet accepted my order, but after specific inquiry re delivery admitted that that was cloud cuckoo land, so I withdrew that order.
I'm counting very much on Fotoman, I'm expecting a 5x7 Shen Hao soon, and see no reason to doubt their commitment.
Regards - Ross Chambers
Blue Mountains New South Wales