I looked at Fastlane and they show 2 master cyl. available. The picture of the one from Teves doesn't show any hardware/seals. The one from Girling (Lucas) shows new mounting nuts and a seal for the mating surface of the master cyl. The online catalog does not list the large o-ring seperately. I guess I would have to get in touch with Phil on this one.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member