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Today put wheel studs on the GP. I found a company that makes studs for BMW's that is now making them for minis. They are 14 x 1.25 x 75 mm long with a bullet nose and came with black nuts. They are TUV approved the quality is top notch and price is very competitive.
When I put studs on my '06 JCW with 14mm lug bolts, I went with WayMotorWorks studs that adapt the 14mm to 12mm. Bigger assortment of wheels that fit the 12mm studs. Some of those lug holes in wheels are just too narrow to fit normal tools for a 14mm lug nut.