single wall top ??

[52napco]

Ok I'm a dummy......How do you tell the difference between the single or double wall tops.
I assume the single is textured on the inside like the outside ??

[Livrat]

A single wall has dome lights on the drivers side, and it bolts to the body from the top down, where as a double wall has no dome lights and bolt to the body from underneath the side rails, both were textured from the factory.