Yes, I have seen such a back, don't know who made it.
It is an original Graflex 4x5" back like those delivered with Speed Graphics.
The window has been reduced to the XL dimensions of about 8x10cm and of course the 4 pins and the ligth tigth frame provide the interface connection to any XL-body.
Has someone any idea where to find such a device ?

thanks in advance

Edwal

these are so rare that most people think they never existed. Keep searching ebay, and know that it won't give a full 4x5 image, inspite of what the lens will cover