Hell i can't remember the word that was used. Its kinda like they joined together to buy certain parts and resources from the same company to cut costs, not necessarily do they use the same stamped sheet metal(now that i reread my text it does imply that) I can't find the link now because it seems that xm radio has signed a contract with the two to put their radios into the two companies cars so that all im able to find. i'll see if the other forums archive has it.