Not many for the Model 10 that don't require gunsmithing, like milling in a dovetail or something. IMO that takes away from the look and whole idea of a Model 10, with it's simple and rugged sights. A better way to go, if you like Rugers, is to get a GP-100 and you can put in any front sight you want within seconds, like a HiViz, Tritium, etc.
A cheap and super easy fix that's been done for decades is neatly painting orange or red Testor's onto the serrated part of the front sight blade. Maybe even paint white paint on the rear notch for contrast....... I did it on a few of mine and it gives a better sight picture than a red plastic insert. If it wears off or fades, just brush on some more! If you don't like it, scrub it off with a toothbrush.