Im replacing the prop shaft seals on a 1988 Johnson 88 SPL. The seal in the prop shaft retainer is apparently leaking around the shaft. The model I have J88MGLCER has the, one piece seal and the manual of course indicates either a one piece seal, as it has, or other models have a two piece seal (actually uses the same seal, with one reversed). The diagrams in the parts schematic only list the two piece seal and do not give me an option of the one piece version. Do I install the two seals in place of the one? I see by the diagram how the seals are placed and instructions state how they are installed. A running change apparently? Let me know if you have seen this.