Are '66 Dart & Valiant convertible top frames interchangeable?

Jim Lusk said

Not sure on the early cars, but '67-'69 Darts and Barracudas used the same top frame and side windows.

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Jim, I believe you, but that makes me wonder how they managed it, since a 67-69 Dart is 3 inches longer than the Barracuda. Is the Dart convertible on a 108" wheelbase?