is there a kit for the old body chrysler 300 front end to make it look like the new one
Nope, there isn't
Old body, do you mean 1st Gen LX Models (2005 - 2010)? The 2nd Gen LX Models (2011 - ) front end won't fit.
You could put a 2010 300 SRT8 front bumper on your 2009 Chrysler 300 Touring. That would look really nice with a chrome or painted Grip grill. (your choice of colors) for the unpainted grill.
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