Radio wiring harness

So want to up grade my sound with plug and play speakers . And I want to amp the two subs under the seat and a small one in the trunk. I need help finding a wiring harness that's fits the stock radio with some RCA so I can run them to the back for the amp. This guy Technic I wish I can get in contact with him but he can't receive PM . Does anyone else know of a place .

Ps. It's a 2010 e90 328i

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Radio wiring harness