The problem with BMW as a doner is the same as the sierra and thats the front uprights. It's massive for what it has to do on the roadster and will require a fabricated bracket for the top ball joint. One way round it could be to make a new 5 stud hub for the mx5 upright or use a granny hub in the sierra upright. The rear bearing carrier is ideal as it would bolt to the current fabricated rear upright with little fuss.
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