I did exactly what you said above. Saved some bucks over buying the Delta HID kit.
I had a buddy of mine do most of the install. There was a little bit of modification that needed to be done on the back of the housing. If I remember right we had to dremel out the center of the cap in order to get the bulb wires out. Then seal it up with the 'right stuff' .
I've had the setup and used it lightly for almost a year now. No real issues.
I have the digital HID kit, lowest color temp they sold and it's perfect for fogs. I used them last night actually... between HID headlights and the HID fogs there is ZERO need to have any other lights on the front of the truck IMO.
I'm getting rid of my Warn light bar with PIAAs since I never use them.
Also .. that Delta label on the front is just that- a label. You can peel it right off.