Duster front window trim - gasket flap

I'm not familiar with the Dusters window gasket but I can tell you that some gaskets use a lockstrip in some areas and self locking in others. 67->69 vert gasket is one example. Self locking on 3 sides, lockstrip along the bottom only. If you study the profiles of voids in the gasket you should be able to tell if it is meant to self lock or if a lock strip goes in there.