I just went to shop and checked the package. It is marked Buckmark long and the number is 70231. I believe that is the replacement package but not absolutely certain.Williams sent me an entire rear sight as a replacement. I called them seeking help when I was unable to adjust the impact with the firesights when I first installed the original. Do not remember to whom I spoke but remember the gentleman being very helpful and knowledgeable.
Hope this helps.
John
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