Seiko are your best bet
Contact the service centre or an AD and they should be able to help you.
I’ve recently adjusted a bracelet but am short of a pin if that makes sense
Where to buy?
All I can see are spring bar adverts!
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Seiko are your best bet
Contact the service centre or an AD and they should be able to help you.
Pretty sure I bought a box from cousins for these, can message you over a pic when I get home if you want