the Malibu/Chevelle roof is the same, it's the chebby A body sailpanel area, rear window opening and catwalk that are different.
back to the OP, if all you need is a few inches of solid roof from the window channel back, you could source it out of a 4 door roof. Have provided that section before to '66 and '67 owners that spliced the piece into what was their rusty front edged roof.
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Buzzards gotta eat... same as worms.
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