kapture group truewide for sale,
modified with a split screen for focussing,
you'll must to be willing to DIY to get the focussing screen to match your Digital back, else
you'll have to ship your digital back to them to get it calibrated. The calibration is simple but tedious, but hey, you only need to do it once. It involves using electrical tape and screws, that was the way it was calibrated when I bought it.
I would like to keep the Mamiya adapter plate as I'm using it for my arca swiss so if you're not on a Mamiya back it does not matter as you can just buy the plate from Kapture group. The plate with calibration will cost $495 USD, but do double check with them.
But if you're interested please email me at firstname.lastname@example.org
p.s. I have the case for it as well.