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Hose connector coupling o-ring size

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Just finished a week of work on a 08 530exc-r only to have a gas leak at the coupling.  KTM want around $95 for a complete rebuild kit (just so I can get 3 o-rings that I need).  So has anyone got the size?  I've heard 8mm OD  1mm thick but that was general for FCR carbs only other bikes.  My worn o-rings measure close to 9mm OD and 1mm thick.  McMaster Carr sells packs of 100 in these sizes of Buna N for about $7.  Anyone done theirs and have a size?

 

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I had the same problem and did the McMaster thing.

I bought two different sizes.  1mm x 7mm ID and 1.5mm x 7mm ID.  I recall using both sizes as the hole in the carb had some wear.  It fixed the leak.

Hope this helps.

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Not sure about the '08 but the 525 inlets use:

Yamaha 3TJ-14564-40-00 or Kiehin W9351-13057

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