A guy I follow on Instagram just did it. He drilled a hole in the back, then filed the rest of the way. He inserted a LED light strip He bought off eBay & earthed it. That way when ever the car was on, they were on. Then He taped the back of it back up leaving a breather for the hot air to escape. Sounds really "budget" & a bit tacky, but the look from the outside was great!
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