I bought these for my 2013 Fiat 500c Abarth fog lights thinking they were going to fit right into the assembly, but they don't. The base of the LED is too far up and too wide for the LED to go in fully without modification. I managed to jam them in after snapping off the little clips. Luckily, where you see that red/orange rubber seal on the LED bulb, there is a gap that makes the base just thin enough to jam into the housing & since its a thin gap, they don't fall out & are held in place. However, they don't go all the way in, so the bulbs are nowhere near as bright as some of the pictures here show.
I am going to try shaving down some of the bulb's base further so that it can go in as far as it needs to go, and I will update my review. They aren't bright at all right now, but they still look really good & I'd still recommend these. Just make sure that the mounting point of this LED (area where you see that red/orange rubber strip & clips) is the same or very similar to the ones on your stock bulbs.
Update: Had to do some heavy trimming, manhandling, & some JB Weld (unfortunately) but I got them to fit. Just bought the wrong pair but didn't feel like waiting for another pair to arrive. Light output is great