Rear bumper fillers

Have 1 Brand new Pair of GM ones in the Boxes. 1st $500.00 + shipping takes them.
 
True or not true?

I contaced http://www.sandkindustries.com/regal2dr.html about their $139.00 bumper fillers.

They stated that they have been making them for 15 years now and that they have only taken back 3 of them due to defects.

Also, they stated that they are the ONLY manufacture making ABS bumper fillers for this car. All of vendors get them from this company.

True or not true?
 
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