I also have the 201QB and used the Maxxair vents. They are more expensive than the Camco but are guaranteed for 6 years. Mine have been on just over 2 years and are still pliable, shiny and look good. Camco seem to crumble with UV. Here is the Maxxair number (in black) Maxxair 0503.1504 00-933069. I used. hope it helps. PS I'm in Arizona
In our 25 foot TT, we have (3) MaxxAir fans (2 7500K with remotes, and 1 8915K w/4-key wall control). The covers on all three can be opened and closed independently from the fan operation. The four way switch in the bath allows for 4 speeds. The others are (I think) 11 speeds, in or out, and these two are pretty quiet at low speed. If you can't easily reach beyond the ceiling, the remote is the way to go.