Replacing the oil lines is not that bad a job, but I have to admit I had a young friend with a hoist do mine. He was able to feed the new lines in from the rear. Access is a bit tight at the oil filter end, but he got it done. I modified some wrenches to make it a bit easier. There are threads here, likely with several different ways of doing the job.

The parts are not very expensive, but not that easy to find. One was a Cohline and the other from MTD, I think. Each in the $60-$80 range. Not sure OE are even available these days.

I imagine you could get car on road again by just replacing using high quality hose and clamps. The hose should be oil & heat resistant and have pressure rating well above the operating pressure. Double clamp if there is room.

I think there is a discussion here by someone who installed band-aid hoses like those. Maybe you bought his car

This is one thread - I am sure there are several others: http://www.peachparts.com/shopforum/diesel-discussion/302729-oil-cooler-line-replacement.html

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5