617 589 00 10 00 I believe is the part number if you go to the dealer. Otherwise, it's a 12mm, 12 point torx. I have one made by Hazet, nice tool. Like $36 I think

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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C