These are the window channels that will go into the doors, and the glass will ride in them. They have to be bent to fit the glass so don’t just slide them into the door frame. Start with the end of the channel ¼-inch from the edge of the glass. This will be the amount of window that will be riding in the division bar channel. Carefully work the channel around the outer edge of the glass. Don’t try to bend the whole corner at once, work up to it and the stainless beading won’t kink.