Wow, I took a look at one of my go to parts house, Pelican Parts. The seal was listed as a special order item, priced over $785.00, for a new one. I checked another house, and it handles discount parts, it was listed for $659.00. I think I'd look a used one, but not on E-Bay, but look for a local wrecker, or "Pull Your Own" car wrecking service. I do see the same part # covers all models Z4 E-89. At this price a junkyard is your friend. Most have a warranty on their parts. Good Luck on your Quest.