I have a Union Spike razor which needs cleaning up. The problem I have is sourcing the large domed washers for peening. I've attached a photo for reference. I want to be able to put the razor back together to look as original as possible. I cannot find these washers anywhere. I'd like to have a few spares in case I cannot reuse the ones I remove. They are smaller than bullseye washers, but larger than those used on most new razors. Any ideas?

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Thanks for any assistance/advice.