Help. Purchased an amsoil dual bypass filter from a local amsoil dealer. Must have gotten an older model because the adapter plate that bolts in place of where the old oil filter went does not fit. Went to local machine shops and found that my oil filter mount on the engine is 1x16, and the adapter plate i am trying to put on is 1x12 threaded. Do the older cummins have this thread type or did I get an International adapter for the powerstroke? Thanks