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Once the boxing plates are held in place, you’ll find that the framerails are not equal widths top and bottom. As you can see, the lower surfaces are wider at the forward edge where they arch inward to provide a bit of extra meat for the OEM crossmember mounting area. A line was scribed (or drawn) on the lower rail surface where the boxing plate lower edge falls when held vertically from the edge of the upper rail edge. The lower rail edges were then trimmed along the mark so the boxing plates could be welded into place forming a true rectangular channel on either side of the new IFS crossmember mounting area.