Cars to engine #4356 used one stud A90566.
After engine #4356 used one stud A90601. Finish is natural.
The placement of this stud is in the rear intake manifold hole closest to the engine block. The purpose is to ease installation and removal of the blower top.
Other fasteners securing the blower top to the manifold are five SA514 bolts, six WA5 lock washer, one NA5 nut. Finish is Parkerized dark.
