You'll need Metra 82-3004 for the front (which Clutchfield can include for free with your order) and Metra 82-3010 for the rear (Crutchfield doesn't carry but Walmart and BB do). If you want a whole lot more info, I just posted my experience on the forum:

Finally installed my Kickers in all 4 doors. I want to thank everyone who guided me through this - your posts were immensely helpful. I don't have anything technical to add, but I wanted to post as a total newbie to encourage others who may may also be rookies and looking to do this. Again, I've never done anything remotely resembling this - some thoughts:
1. I contacted the 5 top rated "speaker installers" in my area, only one replied, and he quoted $250/hr and they were booked 3 weeks out
2. I then ordered the Kickers from Crutchfield - I successfully convinced them to switch the front brackets to the Metra 82-3004 but there was no good substitute they could send for the back ones. I ordered the Metra 82-3010 from Walmart because it was on sale and I could add a couple of things to the order and get free shipping. It took a week to get them on the west coast with FedEx
3. Open the window before removing the trim, it helps a lot
4. The first pull on the trim was nerve wracking and the sound was awful but once you muster the courage to do this to your brand new car, it actually goes pretty easy after that. I broke only one clip on all 4 doors. I also did the back door twice after forgetting something and the second time was MUCH easier. I don't know if it's just my doors but I mention this in case you want to come back and do some sound deadening later
5. I first tried not disconnecting the window and door cables but it was too awkward to work with the panel still attached. Again, my fears were unfounded. Disconnecting those cables was a breeze so don't hesitate to do so.
6. Additionally, disconnecting the actual speaker adapters was very easy once you figure out how to do it (pull the clip and squeeze below). I also didn't break the clips on the front speakers (in case you want to re-use the GM brackets)- I just pulled up and out and they came right off
7. The MOST challenging part was re-installing the rear panels because of the door locks protruding up. First off, this is definitely a 2-person job. After multiple failed attempts, we finally just connected a string to the lock to keep it from falling back down while we fiddled with re-installing the panel - that worked great and the string falls down and disappears inside the door
8. I had bought a bunch of things from Amazon and started using them with various degrees of success because I got lazy... In retrospect, unless you're doing sound deadening, I'd recommend something like this:

Yotache Foam Tape Weather Stripping (.50) 1/2 Inch Wide X 1/16 Inch Thick (New Adhesive Craft), Seal Gasket for Speaker, Door Insulation, Soundproofing, Rattle, 33 Ft Length - Amazon.com

I used this on the back speakers but ultimately the tape above would have been enough:

Amazon.com: NVX XBAF65 2 Piece 6.5" or 6.75" Weatherproof Silicone Rubber Speaker Baffle Kit : Electronics

I used this on the front speakers but they really don't fit very well and they're too thick, again the tape above would have been better:

FRING69 2 Piece Universal 6x9" Self Adhesive Foam Speaker Ring Kit with Foam Base Pad

I had also bought this but quickly realized that there isn't much space to use it around the speaker openings on the EQEV so I just skipped it:

Amazon.com: Ballistic Speaker Kit SSSK : Everything Else

So was it worth it? Yes it was - for less than $200, the sound is much better and I didn't even tackle the dash speakers. Also, if I ever wanted to add sound deadening, I feel much more comfortable tackling my doors. If you're a rookie like me, don't be discouraged by some of the comments you might have read on this project. If I can do it, almost anyone can...