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The 63 lower stainless moulding has a different profile than the 64. Reason being is the 63 moulding attatches to clips that clip over the pinch welded windshield frame underneath the windshield rubber weatherstrip. On 64 and up the lower moulding attatches to clips that are screwed into the pinch welded windshield frame outside of the rubber weatherstrip. Almost. Thus the smaller profile on the 64 and up. Ref the 63 and 64 AIM. Hope this helps.
Brgds
rene