R55/56/57 are the chassis codes for the current generation MINI clubman/cooper/vert. This is the one you want. Not sure the previous generation chassis harness will work. My guess is not.
Current: 2009 E90 M3 | SG | FR | 6Speed | Akrapovic Evo | JRZ RSONE | StopTech Trophy | Cantrell Brake Ducts
On order: 2016 F80 M3 SO | AB XT1 | ZCP | etc.