the hard top and sedan frames are "c" section and the cross member just sat in side the c section.
In my experience having owner several of each body style, its easy on the c sectioned frames to simply move the cross member forward square it up and drill new holes.
the cross member goes up inside the c section, not underneath. I have seen a you tube video where they R&R an engine and trans for I think a 65, the cross member is bolted under the botom of the c section. wrong! it goes up inside.
good luck
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