Check e-bay for the "Genuine BMW" regulator.

I found a seller in Sparks, NV a few months ago, "new in box, Genuine BMW" units for $50.

Got the glass clip from a BMW dealer, appeared to be made of nylon (more durable then the plastic OE part).

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!