The factory issued TSB 8510 due to the earlier pumps without an attached screen (911-107-008-01 and 930-107-008-02) being NLA. New pumps with the screen (911.107.008.05 and 930-107-008-04) need to use the convex cover with out the drain plug (
930-101-902-00).
If you really want to use the older cover with the drain plug. I believe a spacer could be made, use longer studs along with 2 gaskets would work. Please note that I've never done this.