Put a Side mount license plate holder for your custom motorcycle! These Side mounts are the best Side mounts you can buy! We have been producing these Side mounts since 2010. Our Side mounts are made of 5mm thick steel and are solid. These Side mounts can be mounted on your rear axle or rear shocks. A Side mount license plate holder fits on a Harley Davidson but also on many other brands and types of motorcycles. Naturally, a Side mount looks very good on a bobber or chopper.