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I believe that if you're wanting the Bilstein you buy from a vendor that is approved and authorized by them for resale of the product. If you ever thought you might want to take advantage of a warranty issue I believe it's a MUST!!! They have an "authorized" vendor/reseller directory. If the vendor that interests you ain't in their directory I believe you might/could have warranty issues.
You have the conversation regarding applications with the vendor you choose!! E-cataloging is interesting and often convenient but if there's an error in the e-catalog once it's corrected there's no documentation(easily sourced) to help you in a resolution of a problem.