Got my 16" amber strips this week, started a minor tear down on the front end of my mag for the new headlights tonight and front end touch up before reassembling tomorrow. I'd like to suggest you have your LED bling ring supplier solder the power leads to the back of the halo rings vs. the front end for the magnums. Looking at the 300 thread of DIY's, looks like they have the power leads on the back, but if the rest of the mag led halos are like mine, hiding the red/black-red wires is hard when they are soldered at the front. I had to de-resolder mine to get the wires hidden on the backend to hide those suckers! It's late, can't seem to find my 2 part epoxy, need to go get some in the morning....g'night ladies.
Challenger Mods: PWR 393, Mean Street heads, Procharger D1 pushing 11+psi, SHR Nag1, DSS 1400 axles and drive shaft, SHR trans but with Paramount Dominator and stage2 valve body to finally be error code/limp mode free. BBS CH-R's and custom splitter with 2011 front spoiler. AAC SMD halos, 3K fog lights, white stripes, cervini wing, hotchkis springs, custom 10" sub w/ kicker amp, sequential tail lights.
2009 Dodge Challenger SRT8 Procharger D1 Supercharger: 10.895 @ 126.720 MPH
The 300C comes out the back because its a complete circle. The wires coming out the back of the ring would require you to drill a hole. We prefer not to have to make people drill, the wires can be covered with a bit of heat shrink if needed or, like you said, you can swap them to the back fairly easily if you wanted to drill.