Adhesive you can get from your local hardware store along with the four of five screws you need to secure it to the car.

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2007 E60 M5...Loaded like a baby's diaper.
2000 Yamaha R1
2006 E53...Sold
2008 550i...R.I.P.
2001 Honda S2000...Sold
1998 BMW 318ti...Sold