Advice request for an Omega Speedmaster automatic 1020 watch

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Hi I’m hoping to get hold some additional strap links to add to an omega speedmaster automatic 1020 watch I’ve recently acquired. It’s a beautiful watch but the strap is too tight so I’d be very grateful if anybody have any advice for obtaining these as I would like to keep to the original rather than getting a new strap? Any help advice much appreciated. The strap is BOR silver 15.5mm. Many thanks

 
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What numbers, if any, are inside the clasp and on the end links?