From what I remember seeing in the boneyards the 240 has a small radiator with both lines attaching at the bottom. The 300 NA has an oil radiator just as tall as the coolant one, but not quite as wide as the 300 turbo, although the lines looked the same to me from memory. I also would not waste my time trying to salvage a used oil cooler line unless it looked like NEW; these two lines are extremely important to the health of your car. EDIT I misread the post and thought you wanted to salvage a cooler LINE. I think the substantially bigger cooler would be fine, but the lines are different. There is one line on bottom and one on top of the radiator.

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83 300TD 219K HOMER