Do I have to use BMW antifreeze when putting in a new overflow tank or can I just put in a 50/50 mix of top brand?

Where can I buy a socket for my right brake light in my 02 X. It is the bulb that is the bottom light and has the removeable gray socket. It appears to have gone bad as I can move it around and the light comes back on but will not stay on. (anywhere other than my BMW dealership would be great).

Thanks,

Shawn

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2002 BMW X5 4.6is
Nav, Piano Black Trim, Black Leather,
20.8 MPG HWY DALLAS TO MEMPHIS 74 MPH