Advice on split pins of 1171/1 Speedmaster Bracelet

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Hi,

I've got a 1980s Speedmaster 145.022 and it came with a 1171/1 bracelet and 633 endlinks. I understand that this is correct and bracelet appears original to watch.

As the bracelet is more than 30 years old, the split pins holding the bracelet links are bent and quite 'squashed'. In fact, recently I saw that one pin has moved out of the bracelet link. Thankfully, I spotted it in time and avoided a bracelet failure.

How do I get replacement split pins? Would those pins described as 'cotter pins' work? If so, which size should I get (0.8 mm, 0.9 mm or 1.00 mm)?

Would appreciate any help! Thanks.