Just an update: I found the lines for $30 on ebay (free shipping) and installed them yesterday. Working around the ends that go into the radiator was a bit tight, but not really too bad. The other ends simply pop into openings but they are held in by a plate that is secured with a 10mm nut (you have to use an extended socket). Now, that was a real pain to get to, but I was eventually able to loosen it and remove it by hand. The new AC Delco lines weren't exactly shaped like the factory lines so the upper line is now uncomfortably closer to the fan, but everything worked out in the end and no oil was leaking when I turned the car on.
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