I bought one of these monsters for my Linhof.
There's no way the rear cell would ever fit in my 'Crown.
However the thing was in what i believe is a 'basket mount'. There is a regular Compur shutter, but it and the front cell is enclosed by alloy castings.
I had hoped to extract the front cell and shutter to make it simple to mount the lens.
Were all these 121mm Super Angulons mounted this way?