Unibody underside

[Duster2022!]

Have a 72 Duster, anyone know what color the underside of vehicle should be? What was correct from factory Siri g the 70s ?
I read “60s Mopars were only primed and not deliberately painted from factory but had occasional body color over spray underu

 

[Dana67Dart]

Undercoat and be done with it.

 

[niceolddart]

Unless they had the factory undercoating, (Not all Mopars did) they were just grey primer with body color overspray wherever it landed on the undercarriage.