First you have to note that the 5513 has been the longest submariner in production, and they were a lot of variation, bezel teeth, in case shape, dial, print, Crystal crown and tube and so on, so of course all the retaining ring doesn't have the same size, as I said I had gen sealed parts and didn't fit together. This is why rolex recommend to install them themselves at their RSC because they got tools and can install the need retaining ring. If you have the money you can buy 2/3 gen retaining ring and try which one fits, easy to find on eBay or Chronoshop(but expensive there) this is why a complete bezel assembly avoid fitting hassle.