I have a 19935th wheel. someone broke out the back window. I got some quotes from some glass companies and of course the usual camping world and other rv parts sellers. I was referred by a glass company to try Affordable RVing. BINGO they had the part and were very helpful in telling me what I may expect doing on my own. they told me how to measure. gave them a call back with the opening size and they said that they had one. picked it up for under a hundred dollars. THANKS guys!!!