There's a tag on the bottom of the seats.
The manufacturer should be on it.
Contact them, they will be very familiar with your problem and should have replacement upholstery.
If your handy it should be a pretty easy diy, Check YouTube.
I found these by googling "Replace reupholster peeling RV furniture ".
http://www.forestriverforums.com/forums/f2/anyone-in-need-of-upholstery-replacement-159361.html
http://www.irv2.com/forums/f120/recovered-captain-chairs-276309.html
http://www.irv2.com/forums/f59/reupholster-or-replace-furniture-450787.html
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