As mentioned on another thread the 300C shares a different set of headlamps than the 300, 300 Touring and 300 Limited. This will make it a little mor difficult for owners of the lower models to convert to the the 300C OEM HID units.
On closer inspection do you think that the 300 Touring (2nd pic) has a different piece added under the headlamp? The headlamps look similar, but the piece (yellow) under the lamp maybe different. HMMMMM!
It looks like the moulding is different. The conversion would be expensive. Not to mention that I bet the majority of the 300c's come with the upgraded lamps which add another $650.00 to the car price.