2012~2013 SRT have projector fog lights which use a different bulb. You dont need HID fog if you have a new gen SRT.
For the regular Chargers,
Your OEM bulb should look like this:
Your HID fog light bulb should look like this:
The clip lock should be the same for it to fit in directly.
From the info I have gathered it seems 2011+ Charger will require relay harness for the fog light HID to function. So I am not 100% sure on this. On my 08 all I need is a pair of CanBus Error Eliminators.
I suggest the following source for your HID:
1. DDM Tuning:
2. The Retrofit Source:
IMO TRS kit is way better in quality. Although the are certainly more expensive.
If you dont wanna deal with HID wiring complications, here is another route: Super high wattage LED bulb:
27 Watt Osram LED bulb in 5202. They will be a direct swap to your fog light. These will be better than OEM, but dimmer than HID.