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If you do not need portability, the bigger jack is probably best. It should raise the car higher and that can be useful it you want to get it as high as possible on jackstands. You can alternatively put a block of wood on a smaller jack, but that is not as stable. For stock lift point adapters, I bought a set of 4 aluminum ones on ebay for about the cost of one from a BMW specialist shop. I forget the name of the seller.
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