Hi there! I took my '16 340i in to the dealer for a new battery. When I went to put on a cable for a trickle charger, the negative battery bolt was almost impossible to get off, and literally impossible to get back on. I went back to the dealer and they don't have any spares lying around and they don't sell it separate from the negative cable. Does anyone know where I can source one of these bolts? It's not a standard size for a battery bolt, at least not one I can get at O'Reilly or AutoZone or something like that. I know it's M6-1.0 and should be 30mm long, but that's about it. Any advice would be appreciated, thanks!