The ********AZ website actually commits in writing that the parts are the same - that they stock "the exact same parts as the local dealer", and that the parts are "in fact, the very same part, manufactured by the very same company." I suspect that Phil would tell you the same thing. The notion that these huge German OE vendors would stop the production line and retool so they could make inferior parts and then put them in boxes with their good name on them seems to me sort of silly. But that's not to say none of these manufacturers ever make parts for the traditional aftermarket - i.e. without their company name.