Here is a video of what I did to my non-xenon factory headlamps. I did the HID conversion but didn't want the headlights on day and night so check it out and if anyone has better idea or conversion...

I just did this exact upgrade. I purchased the gps antenna off eBay for $8, and a new HMI of the same part # as what you listed. I sent the HMI module to a company that did the GM software flash...