The GIVI E251 (90197) is a universal base plate specifically for Monokey cases. If your vehicle has a carrier installed, you can easily attach a Monokey case. The base plate can be attached to the vehicle using the included wavy plate to secure it to the carrier. I purchased this set to mount an OBKN58 on a new motorcycle, but there was no rear carrier available that could withstand the load capacity. This item is new and unopened, and will be shipped in the same condition as it was delivered.