D Window Gaskets

[bwaysteve]

Just got all my D gaskets to do the door and windows.I am assuming I remove all the remaining bulb gasket and only use the D.
Also looking at the front window on the 65 Ambassador I notice as you look across the bottom of the window as you get about 6in"along the bottom the aluminum has a 3/4 in. that bends up slightly.I thought it was bent except there is one in the same place on the other side.What is the purpose of these two bends?
Sorry no pics.