I cut them down with a hack saw, and then carefully took them down to the appropriate dimension with the sanding station. I had build a jig to ensure that all was level and square.
Next I need to figure out where to put the holes in the push tubes. I measured the inserts that go into the tubes, they insert 0.5" so the rivets would need to be installed 0.25" in from the edge of the tube.
I decided it was best to draw out a template on autocad which would help show the 0.25" offset as well as the proper offsets around the tube.
Now I could easily see where each hole needed to go.