Oil pan blues

Ok here it goes the gasket kit I bought for my 273 engine came with a lot of gaskets !!! My oil pan collar has slots in it both ends ok , now the gasket kit has two different type of robber gaskets for the pan inc the cork for the sides ( length ) of pan , Now when I took the pan off it had both gaskets on it !!!! So I'm not sure what to use , the rubber with the nipples or the solid one with a 1/2 collar on it !! Need advise on what to do here thanks