Doing the same thing myself just now. Bought some Alfa calipers on Ebay and I am either going to run them with a 320 or 330mm disc. Plan on making my own brackets, bought a spare hub from a breakers to make it easier. You will not get adapters for your BMW calipers off the shelf. You can get ones from CJ in the USA at Yother.com for Porsche calipers, Alfa ones from Retro Turbo that are aluminium or Alfa ones that are steel from a German company called Epytec.
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