Interior question 68 Valiant/Barracuda

The seat skins should work without issue.
What if the interior quarter "card" for B'cuda notchback is long enough, dies beyond the seat back as it should but the hole for the winder handle is in a different location? Those are the differences in notchback and fastback. Maybe someone could make a paper copy of the 67 B'cuda notch back quarter card and mail it to you for test fit.