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The WD Motorcycle forum
Sorry can't give you the size but they are small cross section. I didn't have one so used a thin smear of silicon. I get o rings, seals, bearings, shaft repair sleeves etc from Simply Bearings. I think you'll find they have what you want.
Thx Dean, silicon was my fall back tbf!!
email (option): Larkesr@geeeemail.com