My Blaster engine previously had the oil lines cut with screws in them as the block off. I changed it to the plate and gasket. Anyways, there is a rectangular slot or hole on the top of the oil pump cover that I assume a rubber stopper of some sort should be. It didn't have anythign there when I got it. I can't seem to find this part listed or even in schematics to order it. What goes there and can anyone find me a link to get this? Thanks in advance...