Auto Gem lenses.
I ended up using the original plastic lens covers on the front which worked great. I figure I'll order another set of the amber lenses and see what happens. I'm guessing one of the two I get will work.
Dutch, I don't know where you ordered from, or which version of the LEDs you're getting. At first, I thought for absolute certain that I had either received or ordered the wrong set from J&P. Double-checked the part number, my order number, and their catalog, and I did get what they said would fit. I'm not certain their catalog (website, exact fitment for '13 Slim) was correct - I had some boards that were attached to my LED sets that should have fit a flat style signal housing like on my Road King instead of a bullet style like is on the Slim. They looked like this:

... instead of this:

Those extra boards did separate, leaving me with the correct parts. I just put the light face down on a flat surface, and pushed on the board until it split the double-sided gasket that held them in place. Had to clean up a little residue after, but it was all good.
As for installation, that was pretty simple. I didn't even have to doctor up the gasket. What was helpful was to run a wet finger around the O-ring gasket on the lenses, and twist then into place. Took a little bit of gentle persuasion, but they went on neatly. Did check that the LEDs would fit inside the lenses first, of course, and all was fine there - tight fit, but fine.
One more step towards turning the beast into what I have envisioned. Neat collision of old school lenses and high-tech LEDs...



