I was starting to get interested in these, until this. So no different from OEMs, as far as fitment of the bulbs, huh? Oh well. They DO look nice.
I just put these on my 11 Tahoe, got Auxbeam gold H7 LED BULBS. The tip on the bulb would not fit the the opening but then I realized that the tip just unscrews. Took a 4 days later got to drive with them on at night for 5 hours. Lights up the road beautifully. Bulb went right in. There is about 1/2 in of air space behind the led bulb once you put cover back on.
Don't get them from DT MOTO on eBay. They are $40 more then other sellers yet they're all made by spyder. I got mine from dtmoto as it said everywhere that it comes with led bulbs which it does not.
Also, here's some more info :
Plasma tube is not bright enough for DRL use, in daylight it's no brighter then the white paint on the truck. Plasma comes wired to sidemarker led so it's plug and play and comes on with parking lights. Everything is setup to fit you factory bulb connectors and factory parking/turn/drl sockets.
Brackets holding the lamp in place seem flimsy although once you install it the lamps doesn't move around.
In my opinion, way better light then factory lights with 55watt hid bulbs.
On housing it says do not with hid bulbs although the lamps come with an extra low beam bulb cover which has a cutout to fit hid bulb pigtail gromet.