2008 LX Aftermarket Radio question

Hi All,

I've done radio installs in all my past vehicles and i'm not a total newb
Just wanted to make sure that i'm not missing anything before i open the new car up.

I'm planning on putting the F700bt pioneer Avic from my trade in Scion Xb to our new 08 element.

The double din in the Element is the standard size correct?
Are there any mounts or other kits needed? on my old 05 element ex years ago i had an eclipse unit in and they needed to put a radio surround to "fill the gaps"

This is the harness i'll be ordering

http://www.crutchfield.com/p_120701721/Honda-Acura-Suzuki-Receiver-Wire-Harness.html

Once i get that in, the only other time i will be opening the dash is when we upgrade to the EX sub trim & aftermarket sub & rear camera install.

But i dont wanna pick up too much stuff...(boxes are a red flag to significant others!!!! lol)

Thanks in advance!
-Mike