I collected three parts mentioned earlier:
51 46 7459683 Trim rollover protection bar front left - £26.25 + VAT
51 46 7459684 Trim rollover protection bar front right - £26.25 + VAT
54 34 9481141 Wind Deflector - £193.34 + VAT
Total cost with VAT £295.01, £125 more than ordering Wind deflector from factory. It was stock car, so had no chance to spec this option. I hope it makes a difference, but I won't know until next week or later. I may come up with some replacement parts to cover the wholes in the hoops, if necessary. OEM parts £110 each.
Swapping headrests took 5 minutes each, so total work 10-12 minutes. If you can use screw driver, it's not worth paying BMW to do it.
Parts.
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5 screws keeping plastic front in place.
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On the left, front part of headrest, on the right rear part of the headrest. They clip together.
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Wind deflector after installation.
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