Stupid Headliner Question

Does the headliner on a 63-66 Dart hardtop come all the way down the C-pillar? I only ask because I saw these sail panels on the Classic Industries website and now I'm a little confused (happens often).

Do these panels simply install underneath the headliner for additional support? If so, why do they come in different colors?

https://www.classicindustries.com/product/1966/dodge/dart/parts/ma8162101.html

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