YES they do; Shimano are the easiest to find used. SunTour are more scarce as they were only out for a few years and widely used for at most three of those years. Either brands need index shifter levers and an index specific derailer. Any SIS Shimano starting in '85, '86 but only widely used '87 on. Suntour gets tricky, less reason to reach for it and you'll need to really pay attention, it wasn't strictly by year or price and the nomenclature can confuse.

This also may pertain to the OP who should dismiss the idea of stem shifters altogether.
Those were an entry level bike feature; didn't work all that well, were unsightly and don't belong on a Columbus EL frame, you gotta do better than that fellow. It sounds like you're joking.
It's like putting cruiser bars on the bike. No reason at all to not put DT shifters on it.