I did it on the 240D, just replaced everything with dealer parts. The hardest part was the nasty bolts connecting the foremost portion to the manifold. I recall blood being shed. I actually was able to do it all without jacking up the car ... bit of a physical trial but not torture. I think the parts were less than $300, and easy to fit together. No leaks (that I'm aware of).
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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)
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