For lack of space in my vehicle (2 head units in double DIN) I ended up mounting it inside my glovebox.
The supplied extension cable was just the right length.

BE CAREFULL with your sled wires, I had two pull out of their crimp jobs. After experiencing this I took the extra time to disassemble every pin and solder each connection.
Good luck!

Mk2 #105 32g blue, w/tuner
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Mk2 #105 60g