Any ideas on which Sram or Shimano rear derailleur to replace original SunTour XC Comp rear derailleur. Unfortunately SunTour has been out of business for decades and there are just no new parts even. I think updating to Sram or Shimano derailleur would be the best path to take.

All drive components are SunTour (chain, freewheel 12-28, 7 speed, front derailleur, crank, 24, 36, 46 chain rings) except the shifters are Sram Grip Shifters 3.0. If I have to, I would change out other components to get back running right. I also thought about modifying to 1x drive. 36T crank and 11-34 is all I really need.