I've been doing a lot more searching and found a guy with a great writeup.

The difference between the front seal and the rear seal is what makes me start leaning towards the cheaper fix.
Totally different designs.
Another one bites the dust... (coolant transfer pipe on N62) - Page 2 - Bimmerfest - BMW Forums

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Portland, OR - 2004 e53 - 4.4L - 90,000m