Originally Posted by
Barabaika
SunTour went out of business 20 years ago. While metal parts can work forever, plastic parts have deteriorated.
SunTour may be long-defunct, but plenty of their rubber/plastic shifter covers live on in surprisingly good condition. I've got three bikes whose SunTour barcons have intact covers in great shape. I just sent a set of SunTour stem shifters to someone else and those had good covers, too. SunTour shifter covers can regularly be found on eBay in good shape or even NOS.