It is a W lever pedestal that is common in old frames, but when using an STI lever etc., it is necessary to attach a shift wire receiver called a wire adjuster here.
SHIMANO's SM-CS50 outer stopper is an outer holder with an adjuster that is compatible with Shimano aluminum frame shift turbos. Left and right set, mounting bolts are also included. Of course, it also has a cable adjuster, so you can easily adjust the tension of the wire.
Weight: 24g (pair, screwed)