help with aftermarket headunit install

[Praz]

can someone please help me figure out how to hook up the headunit to the car. i bought the metra wiring harness but dont know where to ground the black wire from my headunit. on the stock heaunit i know there is like a little metal attachment that may be for grounding. by the way its a 2000 x5. any help as soon as possible would be greatly appreciated.

[Halston Pitman]

Are you looking for the ground coming off the new head unit or the ground in the metra harness?

[Praz]

there is a spade connection coming off the headunit which needs to be grounded but i cant find a location to ground it.