I got some aftermarket lights with halos, I made a housing for them out of some PVC pipe and fittings. I turned it down to size on my lathe. and mounted them in place with screws like you would the OEM lights from the back. Now the next step will be to wire them in. I think I'll just use a relay hooked up to my parking lights to switch on my fog lights and the halo will turn on after the car is started using another relay (running lights).
Make sure the relay is well protected from weather and away from the battery-- I did this exact mod to another car and the relay was a ball of rust in 6 months. If I had to do it again I would slather some RTV silicone all over it...or use an optical relay, they are usually potted.
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