Where can I purchase a brake backing plate?

Hi,

I assume you are referring to the rear backing plates. I looked up the OEM part numbers and here they are.

Right Rear
5137620AA

Left Rear
5137619AA

I looked up the numbers online and found the original equipment parts to be right around 35.00 dollars each. Here is a link to a dealer that I randomly picked:

https://www.makeitmoparparts.com/2006-chrysler-300-base-gas_2.7_6-transmission_automatic_4-brakes-rear_brakes-backing_plate_5137620AA-item/

Note, the two-part numbers are different, so that means the parts are. Make sure to get the correct one if both aren't needed.

Now, if this is an SRT8, they are different. I will need to know that. I went with the hemi Charger 5.7L since that is what you identified. The SRT8 is a 6.1L

The pic below shows the front backing plates' part numbers.

Pics 2 and 3 are pics of the backing plate. Pic 2 is the rear and pic 3 is the front. Both are for the right side. The left side will be similar.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.