I have to replace an integrated shifter/brake, right side, 7 speed Shimano STX.
Is a shifter for V-brake (e.g., this) compatible?
Bobotech recommends here not to do such replacement.
This question is related to my broken shifter spring one
Generally road caliper and cantilever brakes are not compatible with "V" brakes levers. You have a few basic options. Find a single shifter and reuse your brake lever, find an integrated shifter for canti brakes,( likely a rare find), up grade your brake to a "V" brake. Your local shop may help with some used parts. In my area used brakes go for around $10. This is for arms, pads and a cable noodle. You should see an improvement in braking with the "V" brakes.