Help needed on vintage omega seamaster ref 2849

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Just bought a vintage stainless steel seamaster ref2849. However, the crystal plexi is not original and not in best fit. Does anyone know what specific parts I have to look for? Eg. Parts no? ( currently looking up in ebay but have no glue which size would fit)

Thanks and appreciated!
 
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Omega Part Number PZ5000 for crystal with silver tension ring.
Omega Part Number PX5000 for crystal with gold tension ring.