With the Keybrid you won't have that problem again! In fact, not only are they slim in profile by getting rid of the extra ring, they are multi-functional by clipping to your belt loop and also becoming a money clip.
The company says that the one key design will fit most of the locks on the market and they even have designs that are made for cars. When you buy, you get a blank key that you take and have cut locally to fit your lock.As of now they only come in Silver, but in the future they will be available in multiple colors. You can get yourself a blank Keybrid for $8.99.