The seat shell on the drivers side (US models) closest to the door is cracked vertically. I'm looking for a part number and or replacement part for it without buying a whole new seat. Did some searching but not coming up with anything definitive. I'm talking about the silver/grey shell, not the dark cover on the back. From what I'm seeing in some illustrated parts breakdowns they are separate units. I haven't went to the dealer yet on this, but I figure it would be pricey. Any help is appreciated. Thanks.