Try Mobility RV in Hanlontown, Iowa. They carry obsolete Winnebago parts. I have gotten many things from them that Winnebago no longer stocks. They have a website, just google Winnebago parts. There are also some RV salvage yards listed in the same search.
Ed & Ruby & the 2 cats
2001 Winnebago Brave 30W
7.4 gas Work Horse Chassis
99 Jeep Grand Cherokee