Is 2600 dollars a fair price in ford for a broken rear timing chain cassette on a 2006 explorer?

I took my explorer to ford and they diagnosed that the noice I been asking about is coming from a the rear timing chain cassette. So they have to pull the motor out and service the broken cassette. My problem is I'm getting charged 600 bucks for parts and I found in ford parts the timing chain kit is only 255.33 plus tax I know a couple of gaskets need to be put on but I have doubts that is 600 dollars worth in parts

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