Help with case gasket, Omega Constellation electronic f300hz

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Hi, could someone tell me where to get a new case gasket for this watch, from what I can see its ref. 088NS5081 or #088-0800 or 088.5081NS
Confusing on cousins it says its 31.6mm x 0.8mm but it says it dosnt sell them as they are an official omega item. Ive been scouring the Internet for the correct gasket but cant find one in the UK. I have a bag of gineric o ring gaskets I tried a 31mm x 0.7mm but it just pops out and it no good. Your expertise and experience is needed. Many thanks.
 
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If you post the case number I can check if this is the right O-ring, but the dimensions for it are:

088NS5081 | SEAL O-RING d30 D31.6 ø0.8
 
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If you post the case number I can check if this is the right O-ring, but the dimensions for it are:

088NS5081 | SEAL O-RING d30 D31.6 ø0.8
198.002

Many thanks
 
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198.002

Many thanks

088NS5081 is the one Omega calls for on this case.
 
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Any idea where I can get one?

Any simple O-ring with the same dimensions will work.
 
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Where
Any simple O-ring with the same dimensions will work.
Where would be the best place to get one?
 
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Where

Where would be the best place to get one?

Have you tried using Google? If so, and you came up empty, then contact the watch material supplier that is nearest you...
 
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Yeah tried all that.

What material suppliers did you contact? Please list them all...