I just did this with
www.superbrightleds.com. I had the Honda incandescent SLO bulbs but here in Germany I was afraid people would not be able to differentiate the brightness difference with all of the new tech bulbs and size of the Audi Porsche and MB lights.
They downright plug/ play, bright without the reflectors. I have single rectangular rear lights. They snap on and off
BA15 45 High Power LED Tower bulb at $ 24.95 each . Red 1157-R45-T