PS: I used a little grease to hold the small metal disc in the booster. It goes right in the center. A little grease kept it in place while figuring out the rest. I used a telescoping magnet to set it in place and then slid the magnet down to break the magnetic connection to it.

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2006 BMW X5, 3.0i - 161,000 miles
2003 Ford Mustang GT - because having Two cars that keep dying seemed more exciting.