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 is a new, unopened item and will be shipped in the same condition as it was delivered.