I have comfort seats in my E53. I simply had them replaced with the ones Invision Industries. They are a little bit bigger than the comfort seat headrests but you retain the power feature of them and the color match is perfect. I have some pics on my site.

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2011 550xi Carbon Black/Oyster, M-Sport, Premium Package, Technology Package, Electronic Damper Control, Dynamic Drive, Comfort Access, Active Seats, Surround Cameras

2013 X5 5.0 Space Grey/Black, M-Sport, Premium Package, Technology Package, Comfort Access, Surround Cameras