Has this been done on e70? If so is there any DIY instructions? Also does anyone know the part numbers for the retrofit kit please?

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Garage:
current: '03 Audi A4 1.8tq GIACFXK04 (mine)
'08 BMW X5 3.0i (wife's)
past: '92 BMW 850ci, '97 BMW 540i RIP (mine)
'93 MB 500sel, '94 BMW 740i, '97 BMW 740iL, '01 BMW X5 3.0i, '06 BMW X5 3.0i (wife's)