Originally Posted by Ironfish653

Ok. Well, now we're getting somewhere, but not anywhere close to where we thought you were going, based on the responses you got to your original post.

Drop bar (road bike) brake levers have mounted pretty much the same way for about the last 50 years or so. The diameter of drop bars has been standard for a long, long time You can mount new levers on an old bike, or old levers on a new bike, but you generally replace the whole assembly, not parts of it.
If you want to convert a bike that has the brake levers and shifters mounted separately, like yours, to have integrated 'STI' style brake/shifters, you will have to replace the whole assembly, you can't just add the shifter parts to brake levers you already have.