Never a dumb question. You need to ask for a rear sight specifically for the 17-5. There is a difference in the length of the sight, square or round front, location of mounting holes etc. between models, so you need to be specific. Brownells may have some, or Numrich gun parts. S&W may also have parts for that model, it would be from 1988 period, so I doubt it but it never hurts to ask.
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H Richard
SWCA1967 SWHF244
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