It's been a over a year, but if i recall correctly it was a 6 or 8 mm. Ratchet was a standard 3/8 drive, but a friend of mine had a 36" (yes 3 feet) extension which was a gift from God for the job.

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Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)