Want to buy a decent shift lever or brake lever
For what? It would be helpful to know what your plans are because shift levers come in all kinds of dimensions.
just needs to fit onto a 3/4"dia. control bar.....other dimensions are not important.
For Ruckstell shift lever? Your best bet might be a parking brake handle. The hole should be the same size and you can rivet in place after you get it positioned. Happy hunting.