At least one guide member extends longitudinally along at least a portion of a stowed side curtain airbag. At least one guide ramp directs deployment of the side curtain airbag toward the openable passage defined at least in part by one or more trim pieces. The guide member surrounds the side curtain airbag on three sides to define an airbag deployment opening facing a rear surface of the one or more trim pieces adjacent the openable passage. The interior trim structure covers the stowed side curtain airbag and allows deployment of the side curtain airbag through an interface joint to a position along a sidewall of a passenger compartment adjacent a rear seat location of a two-door coupe style vehicle. The interface joint defines an openable passage along the first and second abutting edges allowing deployment of a side curtain airbag through the interface joint.