Yeah, but that big deflector on that's held on the back of the axle flange by the wheel studs sticks past this area, so that any blow by through the oil seal already lands inside it and is diverted. Once I analyzed it, I realized how important the larger gaskets were that go underneath the large oil deflector and between the axle flange and the brake drum. My truck didn't have these, so any oil seepage blew right past the deflector and got on my brakes. I'm using both gaskets this rebuild, but still wondering if I really need to track down the missing part.