Trying to replace rear carpet trim
 

Recently had a waterleak from back glass in my '04 3500 quad cab. Water had been leaking in for quite some time and made the carpet trim under my rear seats moldy and smell all funky. I went to the dealer and cannot get the correct new piece of trim, originally ordered me the plastic trim which I do not have.

Has anyone run in to this problem before? I need to get this trim piece replaced asap due to fact that I am going away for Thanksgiving. Any help would be greatly appreciated, I'll try to take some piece of the current moldly trim later on today. I called the dealer back today and the trim piece I need doesn't come up on the parts fish, shows it as one whole piece along with front carpet section which is not correct.