You should be able to get one. Just go to your local RV parts department and buy and replace. I did it on my 87 Allegro a couple of years ago. I replaced the entire hatch on my 03 Chateau on Saturday. Is the intake in a plastic hatch? If so you may not be able to unless you can remove the city intake from the hatch. I didn't want to go through the hassle of doing that so replaced the entire unit.
2017 Grand Design Reflection 303 RLS
1997 GMC Sierra 3500 Dually