Need 1" cup seals for Goodyear brake master cylinder #511738/218073-2. Original Goodyear part no. 217957-5. Automotive cannot be used as they are not compatible with aircraft H-5606 mineral based hydraulic fluid. I believe Nitrile compound is impervious to any type of fluid, but I cannot find such a cup seal made of Nitrile. Any ideas would be much appreciated.
Thanks in advance, Bob
