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Wahl der Lautsprecher-Systeme
You can buy these as a kit or the parts individually.

The first thing you're going to want is an interior trimming tool kit. These kits permit you to remove the interior trim bits without breaking them. The plastic is not going to scratch in your bits, although the metal are less difficult to use. The following tool you'll need is a tool to remove the old Stereo.
Most cars will require a DIN tool, check to see what tool your car needs before buying.