You could just get the factory iPod connection.
If you want Bluetooth after you can also just get a module that goes from the 30 pin Apple connection to Bluetooth.
Bovee 1000 Wireless Bluetooth Music Interface Adapter for in Car iPod Integration https://www.amazon.co.uk/dp/B00B52LL..._YeZXCbYK72T6Z
I have the above in the Lexus and it's very good.
If you don't mind spending, you could fit an NBT, I did it in the M5 and it was the best mod I did to the car
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