I don’t know anything about fabric but I do see you’re in Parker CO. I’d give Hallmark a call and see what they suggest. They really do love their customers and are very friendly people; I’d be surprised if they didn’t have something you could use in stock if you don’t mind taking a little drive.
By the way my last Hallmark was a 1994 that I bought used from a Lance dealer in 1998. I needed a few things for it when I first bought it and some information on how it was wired. The people at Hallmark treated me like I had bought it directly from them.
They truly provide some of the best customer service in the RV manufacturing industry. That’s why I bought a new one from them when the time came.