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18mm lug width? If you want period correct vintage, a No.12/1037 with 70 or 570 end links should work. They pop up for sale on eBay (beware of fakes) and on OF from time to time. There may be other vintage options as well. I believe that Omega makes a modern BOR bracelet that may fit, but I can't remember the bracelet reference or the correct end links.
I think it is not obvious it's a fake.
Tbh I bought a seamaster deville and snagged the BOR from it for my pie pan. Best way to go about it lol, cheapest too. 570 endlinks no.12 bracelet. Fits nicely, good luck!