No, the Blazers are an HID projector out of the box but they do not have the solenoid built in, they are low beam only meaning the cutoff shield is fixed. If you were to put the Matchbox projectors in your fog lights, you could just clip the solenoid wires since you wouldn't need the high beam function. If I were you, I'd do wire the fogs using your parking lights as the trigger. If you wire them up to your low beams, every time you cycle the high beams, the fogs have to shut off. HID's don't like to be cycled quickly, it burns out the ballast. When I put the Blazers and HID's in my fogs, I did the fog light anytime mod just for that very reason. If you want to get fancy, you could always have the Matchbox high beams hooked up so when you hit your high beams, your fog lights go to high beam also.
Anyways, I figure I'll learn a ton on my heads and hopefully get some sweet headlights out of the deal. At this point I am thinking something like this for my fogs: Matchbox wire in the bi-xenon fog highs to a new switch. I already have the fogs anytime but would like the option of having the projector fogs have both the cutoff and highs but at my disposal. My concerns with this mod are: sealing the back of the Matchbox themselves and wether I cut the housings lenses off or not. And aiming them I suppose, but that goes for my headlights too.
The guys on HID Planet do not seem near as crude as most of the posts on TW. Those guys are freaking craftsmen and mount the projector housings for full adjustment. None of this epoxy to the housing and hope for the best b/s.
I had no idea what I was getting myself into. I just want some sweet working lights that don't cost $1,500. Maybe I'll turn into one of these retro geeks in the process...