I did a similar repair on my truck when I couldn't locate the correct lines from the dealership or other sources. I went to a brake supply shop and purchased hardlines with the correct fiittings and ID. After bending them into shape(using old lines as a pattern) I joined the front and back using a short section of hose and two clamps on each side. It has held up for 6 months very well.

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81 300D Turbo 190K sold
83 300sd 319K best $500 I ever spent-daily driverw/ 2 tank WVO set up