This thread is confusing. I went back and re-read the OP, and I think he's working on a sedan rather than an E53. If so, check out E90post, as it's a popular 3-series forum.

As others have pointed out, the SAS on an e53 is a plastic stand-alone module that slips over the steering column under the dash. I have no idea if an E90 is the same.

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)