That was the first thing I changed when I bought my 500T.

I used these for the running lights and they did require a resistor in paralleled to the bulb. Easy to do for the running lights.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I used these for the fog lights. They kinda suck as I had to pull the bumper cover to change the bulbs. That's why I was installing them though. Should never have to change them again. They did not require a resistor. No codes or fault indicators.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


Lastly, I used these for the head lights. They also didn't require a resistor. Just plug and play. The light pattern was the same and the light output was increased. They certainly don't match HIDs but they're bright enough for me.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Now all my front lights match in color and shouldn't have to be changed again for quite some time.