Looking for a 166.023 bracelet

1037/513.

The actual market value of that bracelet is more in the $250 range if you're patient. Set a search on eBay and keep tabs on various sales forums.

Unfortunately, I'm not familiar with that specific reference or endlinks. Note that it's not just the curvature, but the position of the spring-bar relative to the end of the link, which needs to line up with the lug holes.

The #513 endlinks are considered correct for that reference. Sometimes you can find alternatives by using Google image to search for the watch reference, identify photos of the watch and then go to the website with the original images, e.g. sales listings. Often the listings have photos showing the watch from the back and you can read the numbers on the endlinks. That way you can see if the endlinks appear to be a good fit. It can be a little risky to experiment with other endlinks because you never know what modification someone may have done to make them fit.

As Dan says, have to search for other examples to see if any other Endlinks appear to work. However, I’d say there’s a good chance it needs to be those specific Endlinks. If you’re lucky there might be another set of Endlinks that work but you certainly won’t simply be able to use any that are 18mm

With this unique case design your going to need the 513s.