Can you put up a pic of the black lines so that we can be sure?
If it is the cooler lines, then the best thing would be to go get a cooler off a w123 240 or 300D at a junk yard or clunker. Some on here have made new lines out of hydraulic hose, you need to weld the cooler fittings on to the hydraulic fittings though.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving