http://www.bmwusa.com/Standard/Content/Accessories/BMWMotorsportparts.aspx
A PDF catalog with part numbers is available for Z4, E36 M3, E46 M3, E90 320si. Looking at some of the PDF's looks like you can order a motorpsorts chassis even.
From the website:
I don't know if this is recent but I just came accross this information on a blog.Now, for the first time ever in the United States, you can purchase authentic BMW Motorsport parts to offer true BMW performance, available at select BMW centers. It's the only way to push your track-approved BMW model to its limits.
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