CottonPicker--I can't say for sure, but I think magnums have H3 bulbs....

As Cliff says,you drill a hole in the back of the existing housing, the ones I did like it-- after install,I caulked the hole shut and most people would think it's OEM.

Most of it is how creative you want to be,,,,and how much money you want to spend.

I went with DDM on all mine, and the most I spent was $45 for a pair...and that includes the 4inch rounds that I had to get a new reflector.

It does appear, the next generation of complete lights is coming out...... $60-80 for a complete HID fixture with HID Bulb. If you look back on a few of the post..... some of them links are starting to show up,but haven't heard "unbiased" reveiws other then the guys putting the links