No, the stock primary comes with two bolt holes just to the left of the clutch inspection cover. The top hole is filled with one of the those black plastic snap plugs.
Pretty sure it is there from another control setup. Easy way to get ride of it is to just fill it will black silicone or clear then touch it up wit black paint.
When I had my primary powder coated I put in a low profile flat head screw/bolt and had them coat over it since there is no use for the hole.