I have the KK XB box blade (48"). It is build bery well. Without rippers, it weighs around 260lbs, or 300lbs with rippers in. I also have 2 5 gallon buckets fillled with rocks that I can place on if/when I need extra weight (they run about 80lbs a piece). The shorter sidewalls of the XB works better with the older model BXs due to there lower linkage hieght. I think the draft pins measure approx 12" off the ground where as other, full size, BBs are around 16-18".
You may be able to fit it, however your are going to definitely sacrifice max lift height. This is especially true when the rippers are down. I am with barry, the 48" can/will stop the tractor cold depending on the soil conditions. I loose traction many times before that happens.
