I guess from the picture you are speaking of the Oil Supply Tubing to the Turbocharger.

Since the original tubing is reliable and works a replacement would not be an upgrade just a replacement.
I do not know of any braided Hose that will last 25+years.

If you are speaking of the Oil Supply Line/Plastic Tubing with Banjos from the Block to the Fuel Injection Pump I have an extra new one I will sell for $13+ shipping (need zip code to check the amount for shipping).

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84 300D, 82 Volvo 244Gl Diesel