The oil returning from the turbo does not have a high pressure so there is no need for the braided SS hose. Regular Oil Cooler hose would work fine and be easier to clamp with a regular hose clamp.
However, it might be that the tubing helps to keep the crankcase end of the oil return tubing in place since it cannot pop up and out with the tubes there.

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84 300D, 82 Volvo 244Gl Diesel