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You might try contacting Apple Rubber Products or Zatkoff Seals and Packings. They both specialize in O-Rings. McMaster is just a catalog supply house. Zatkoff stocks metric o-rings which is likely what's in that Bosch pump. You might also see if the seal is available in Viton. It's much more chemically resistant than typical rubber.
BTW I hear the newer "correct" pumps aren't as reliable as the older ones. Some people upgrade to a Pierburg pump with the same pressure and flow capacity for CIS.
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'73 911T (Since '83 - PCA since '84), '10 C2S, '85 944 (Gifted), '83 944 (Sold);
BMWs: '00 328i ZSP, '03 525i M-Sport, '01 325i (Totaled), '96 328i (Sold), '97 328i and '07 328i (Daughter's)
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