I agree with RVThere, I'd go with separate wiring harness and bulbs especially on the MINI. They are manufactured by BMW and use CANBUS electronics to detect blown bulbs etc. I think that cutting in to that system might cause strange electrical problems.
Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2012 Honda CRV on Blue Ox Aventa LX tow bar. Full timers since Jan 2012.