The filter cover is different on most Z models, the 1.9 uses a 76mm cap, the non-///M's used the 36mm and the ///M's use the 13mm. Go figure, you would think that they could make one work for all three engine type wouldn't you. As to the oil rings, my 1.9 uses three on the cover, one each at the top and bottom of filter tube and one on the cap itself, and the copper ring for the drain plug.