Well, it is quite easy to know the mount of your toilet handle. First of all, front-mount toilet handles are the most common, so there is a high chance that your toilet handle is front-mount. The handle directly faces you and is located at the top left of the toilet. You could also be using one of the other types of handles. The toilet flush handle side mount is also located at the top of the tank but to one side. If the angle mount on the arm is 45-degree, you can attach it to the flash valve located around the center of the toilet tank. Simply looking at the inside and outside of your tank, you can easily tell what type of mount your toilet handle uses.