from that HIR guy...
Of course I can do something for you; I already have the lowest prices available on the bulbs, and I have them in stock. I encourage you to buy as many as you like.
I just looked at your forum; allow me to make a couple of observations. Neither HID retrofit kits nor HIR bulbs are technically DOT "legal" in your cars; only 9005s and 9006s are. It is an accident of the way the regulations were written that the HIRs can be used in the 900X housings. When you do put the HIRs in your 9000 housings, the filament is in exactly the same location as stock and it's oriented in the same direction, so the light pattern is identical, just brighter. It's a matter of DOT definition that the HIR bulbs are much brighter than the 900X bulbs, not just the manufacturer's say-so; it's defined in FMVSS 105 or 108. The HIRs are stock on some cars, and they're legal because they came in housings that were approved for them. Anything you do that changes the OEM specs is "illegal", but there are no DOT police out there busting violators. HID retrofit kits put the plasma arc in various locations that are NOT where the stock filaments were; your light pattern will be different, tho they're undeniably bright. The only legal retrofit HIDs would be part of a full retrofit housing assembly designed for the HID bulbs. Valeo/Sylvania makes them for the Chevy side:
http://www.xesighting.com/index1.html
I don't know of any for the GMC models. Those are the only ones I know of that have DOT markings. As a practical matter, tho, who cares? Junk HID kits are so cheap now that they're all over the place, good light or not.
Like I said, the Denali housings have four high beams in them, and can take four HIR9011s. They have projector-beam lows, and regular housings have reflector lows. You can also do a hi-lo conversion and run high beam bulbs in your low sockets on the non-Denali lights, but I only recommend it on projectors; you'll probably get a lot of glare with reflectors. If anyone is curious, here's how: