Used Whelen strobe for tail light. New, this thing is silly expensive. Yours for $100 plus $15 shipping anywhere in the US. This came off my RV-7A (which is about to go up for sale, so if you're interested in an Full Dynon w/Garmin GPS 175, IFR RV-7A, let me know) and I replaced it with a new SunTail LED.
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