I just purchased the DDX7015 for my H2. The unit
will fit in the double din opening but you are
going to have some problems. If you are doing the install yourself the unit has no brackets so you will have to make some. I could not find any on the internet so I made them myself. Second, the snap ring that goes around the front of the radio pushes the unit too far out of the cavity. If you keep the trim ring you will have to cut away some of the plastic (in the h2 cavity) behind the radio to make it seat properly. If you lose it, the radio fits just about perfect. You can not mount the trim ring on the outside of the dash because the dash around factory radio is "angled in" and the
trim ring is flat. You might consider cutting into the exterior of the factory dash. I did not want to modify the factory dash at all. Once to get past those problems the biggest headache will be connecting the onstar, chimes and steering wheel contols. After alot of research here are the highlites: You have to determine which bose amp is in your H2. I have to 2004 without the premium bose sound system. In the glove box the radio code is marked "UQA". If you have the H2 with the standard bose like I do you are in luck. Another way to determine which amp you have is by unplugging the radio, if you lose the chimes - you have the standard "dumb amp". If you still have your chimes you more than likely have the premium amp.If you have premium bose sound and you are retaining the factory amp. You will lose the fade controls on any aftermarket radio you install. This kinda stinks because the DDX7015 has "dual
zone" ability so you can listen to the radio in the front speakers and listen to a dvd in the back. From the way I understand it, the premium bose only accepts two channels one left and one right. Then a seperate contol wire controls the fade on the factory radio. The standard bose sound set up is quite different. It accepts all four sound channels. There are a bunch of bus adapters on the market. Here is what I found; on the soundgate Digistar B you must install a seperate speaker under the dash to hear onstar. The Digistar B retains the fade control but I don't like the fact that you can't control the onstar through the aftermarket radio. The GMOS-02 by metra is what I was shipped by crutchfield when I purchased the radio. Don't waste your time with this. It has only two input channels left and right, which means no fade contols. The volume in the front two speakers is so loud it overpowers the rear to the point you can barely hear it. The onstar interface on the metra gmos-02 actually turns the radio off when you press the onstar button. It does not intergrate with the radio at all in my opinion. If you have the set up I have use the PAC OS2-Bose. It like the Digistar B keeps all 4 channels but it also has a phone input wire that attaches from the interface into to phone input wire on the radio. This allows you to control the volume on the onstar through the radio and mutes the sound so that the call takes priority. Most importantly, you do not have to install a seperate speaker. The PAC also keeps the radio's ability to "stay on" for 10 minutes after you remove the key from the ignition. Also you will need the PAC CM1 to keep the warning chimes and the steering wheel radio control adapter(the part # escapes me) if you need it, I will post it. One more thing, you need a DOUBLE DIN TRIM RING KIT (ABS) [UNIVERSAL FIT] to hide the gaps around the radio. Here is the link.
http://www.autotoys.com/x/catalog/DOUBLE_DIN_TRIM_RING_KIT_ABS_UNIVERSAL_FIT_p_984.h tml
You can cut and mold it yourself. It solves the exposed gaps once the radio is installed. I hope this helps. I am finishing the install this weekend.
Good Luck to anyone attempting this.