Hi. I don’t know of a drop in replacement, but I will say that I have had great luck in repairing broken sliders on mine. The casing often gets loose, preventing good contact. So, depending on your situation, you might not really have dead sliders. Desolder the slider and then squeeze the tabs back together with pliers so that the casing is nice and tight. Test with a meter before reinstalling to ensure good resistance over the entire span.

best - DT