I think that the answer is obvious, but I don't want to mess up an expensive top frame so I'm asking those who have walked this road before me. This is a Rodwell top, but I think that my question applies to any roadster top frame that one might buy, mass produced for the street rod market. The top is sitting atop the windshield frame, but the stanchions are hand tight, not yet tight to the body which has no bearing on my question. This first picture is from the front, showing that the top frame is biased outboard about 1.5" from the mounting tab on the body. The other side is the same, which makes the mis-match nominal 3".

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This is from the bottom rear, showing the angle outboard from back to front.
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And this is from below, showing the same angled condition static.
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It seems to me that the answer is that the bottom rear bracket, which is formed in a "U" shape to fit around the top of the body behind the cockpit, needs to be gently bent at the corners to bring the side pieces in to match the width of the mounts. Again, it's likely obvious, and it may well be that every top frame made is expected to be "tweaked" to fit but there are no instructions on the fitting process for either windshield or top. Hoping that someone who's done these tops before, Rodwell, RodTops, Chaver's or others that have this non-folding frame can ease my mind on the fitting approach.