You should be able to download your manual although that section is no longer on this site. Call Winnebago and ask for a soft copy..
If you need a replacement slide topper, your best bet is to remove the existing one and get a local canvas or preferably a marine canvas dealer to make one based on the existing one. They slide in and out of the slotted hardware so are easy to remove ..... note there is a single screw holding them on both ends of the wall and coach attachments that need to be removed.
It is a very simple task to replace them. Good luck!
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