Okay, that's all the confirmation I needed.  Thanks Jorge and Marc for chiming in. I disassembled my ab from my kidney (the third time now...).     My measurements to shorten the kidney were going to originate from the top edge.  I cut off the return at the bottom and left the overall height of the kidney to just a little over 155mm.   I measured 145mm as the height I wanted the kidney to be with the return.  I allowed about 10mm to mount the returns for my brackets with a little extra re
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