Yes. The original has a notch like the one you mentioned is currently on Ebay. Also I was looking at the same one offered by Summit Racing. I even checked FABO and most of the threads I read are related to having the correct oil pan for originality. Does anyone have a 70-72 duster with a small block than can check for clearance related to the "notch"? The center link I have is a drop link 70-72 a body.