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Are hubcentric spacers really necessary? Looking at 7mm and 10mm spacers, and seems the only options for Mini CB are 5 and 15. Universal spacers are so much cheaper.
Unless you have done a stud conversion it is essential especially to improve the longevity of your wheel bearings if you get a universal also get hub rings to again help the longevity of your wheel bearings.
They do make it easier to put the wheel on the car if you still use lugs.
That's debatable. Lugs are either conical or ball seat so that probably helps seat the wheels correctly. Given how cheap hubcentric rings are though, would be better to just use them.