I used braided stainless line from summit racing. They are -3 I think. They sell the AN lines with ends already on them in different lengths. The problem is adapting to the oddball/metric Mercedes connections. I used the old fitting at the oil filter and mig welded an adapter to it. I fabbed an adapter for the oil pressure gauge from a metric brake bleeder, welding an adapter to it also. Then pressure tested everything. It worked great for me, but if you can't weld, that may be a problem. Getting this wrong could easily be an engine fatality. Getting it right can prevent said fatality.

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Diesel-guy