Based on that description, I don't really understand what this person was referring to. Even if there were some 516 end-links that were originally 18mm (which I doubt), I don't think they would be desirable or valuable. The usual 20mm-wide 516 end links are desirable because they are correct for vintage Speedmaster and Seamaster 300 watches, which are highly collectible and very valuable, often in the 5-figure range. 18mm end-links are not as desirable in general, and modified parts are always less interesting to collectors. Nobody would put a filed-down set of 18mm 516 end-links on their $12k Speedmaster with 20mm lug spacing. It would look terrible. However, they might buy the bracelet and hope to find another pair of end-links elsewhere, which would not be cheap or easy.
IMO, you will want to sell the bracelet and watch separately. As I mentioned, someone with an old Speedmaster or Seamaster 300 will want it for their watch, and they won't necessarily want your watch, which is better sold separately.
Hope this helps, and good luck. You may get some offers by PM, but be careful. Long-time members are generally very trustworthy, but there are always scammers lurking around.
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