Yeah, Mercedes uses European bubble brake lines incompatible with US double flare tools. They are hard to find. Autozone stocked only an adapter, Jap flare on one end, Germany bubble on the other. Car quest had nothing. Advance Auto Parts had everything including the unions. Measure your old line along the bends with a tape measure, get something a little bit longer. Get a line a little longer than you need, or a couple, and a union or two. If you are a little bit long you can bend the extra into a 3" circle just above the connection to the rubber hose. A tip the Advance Auto lines had red ends, and something that looks like a little ball on the end. I use a Lisle bender, that Car Quest sells.