Hey, stuff changes. No big deal. Which stamping plant, by the way? They don't install the roof at the stamping plant. In any case, for previous model, it was RSW. For other steel products, it's RSW. Although, even F-150 and Super Duty have some RSW (front and rear of the roof), but are still mostly SPR along the ditch (and SPR pretty much everywhere else). We don't do a lot of aluminum welding.
As for overhem sealer, I'm thinking that yes, it should be present. Or a strip. I don't like to count on e-coat for exposed rivets. And given that I have one of these on order, I really want to get to the bottom of it. I've just asked our corporate product development static sealing expert what's going on with the roof ditch sealer. I'll post back when I hear back.