I'll bet that vinyl was cut for 68-70 Charger. That would explain the excess for the C pillar and none for under the rear window.
Dark blue would look good and you know what black looks like on it. I'd stay away from white. It wouldn't look good (my opinion) and white vinyl tops are a ***** to keep looking nice.
You're absolutely right! It does look like it was cut for Charger. Thanks!