I am doing a clutch change and while I have the flywheel off, figured it a good idea to also replace the 110mmx90x12 crank seal. I notice the original KACO brand seal is "directional" with tiny swirl lines on outside surface of sealing lip. Was thinking of replacing it with a good quality viton "non directional" aftermarket seal? Would this be foolish. IE, has anyone had success with aftermarket nondirectional seals???