I don't know of one, don't see SP101 sights on the Millett site.
You could have a colored front insert gunsmith installed at some cost, you could have a fibre optic front sight installed at greater cost for the machine work.
You could paint them. I have several sights painted with Model Master Fluorescent Red over a white base coat. They stand out about as well as the high priced spread. Degrease the sight blade and paint carefully with a very small brush with the bristles cut off short. It might take a few tries but you can get a very neat job.
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