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Sounds like you should have what you need. As Richard said, May want to replace the others, I did the same. There is one for each axle basically. The front one on my coach looked ok. 

So the other thing that when this happened made me ask why has this not happened to me before? Well I looked and my Wanderlodge being an 84 that bottom exhaust port is made out of metal not plastic, so that’s why it has not failed. I was going to look to see if the exhaust ports are available in metal for replacement so this will not be an issue again in 10 or 20 years.