I am purchasing the D3X with the steering wheel adapter, and I am aware of my need for a harness, before I order it I am just wondering if the right harness is the Metra Into Car Harness - 707550?

And is there anything else that I will be needing as well?

Thank you in advance.

depending on what stock audio system you have , you will need the following:

70-7550 without bose

70-7551 with bose

95-7514 dash kit

you may or may not need an antenna adaptor as well:

40-ni12

or

40-ni20

not sure of the year cutoffs

I have the Bose System, and a 2.5SL

then you want the 70-7551