Double din player installed in GE Jazz

Hi!

Anyone installed a double din player in 2009 GE jazz,

If I want to keep the steering wheel button functions with the new unit and rear camera, is this the right harness to buy? Anything else I need to beware?
Please share your experience with me.

http://www.ebay.com.au/itm/400545991...84.m1423.l2648

http://www.ebay.com.au/itm/181343405...84.m1423.l2649

Many thanks :)

I wouldn't buy that head unit.

only 2x pre outs.

If you planning for 4 speakers and sub to be amped will cause road block.