I found a place I buy them from for $24 or maybe it was $30 something. I cant remember. That was for the e39 and the e46. Havent bought any for the e53 yet but I guess I should to stock up.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install