The W114/W115 box bolts to the frame (so to speak). If these 3 mounts are the same, and I think they are, then grab the hoses from the donor car and use them. Look inside the left front wheel opening toward the rear to see the mounting bolts.

If you need hoses, you can have them remade at a hydraulic shop with the appropriate PS box ends.

I think the return line is a simple low pressure line held with hose clamps, so only the high pressure line would require a professional replacement.

The PS pump should be in the same location on both engines.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles