This is the web site for the A5/S5 electronic brochure. It display all the standard and optional equipment for the A5 and s5.
http://www.audiusa.com/etc/medialib/cms4imp/audi2/aoa/product_my08/a5my08/pdfs.Par.0002.File.pdf
http://www.audiusa.com/etc/medialib/cms4imp/audi2/aoa/product_my08/a5my08/pdfs.Par.0002.File.pdf