Cheap roof vent unit needed (ideally 2!)

diddlydoos

Hi all!  We have a lovely old Swift Challenger, 14ft and are aiming to go away in a couple of weeks for a few days then off to the D&C rally at Woodlands... but!

Our bathroom roof vent has disintigrated! I have been looking online but can only seem to get a light unit - we don't need a light (in fact have nothing to wire it to), we just need the basic vent unit.  I can't find them and the light units are abou £50
a piece!

Any ideas?  We would be really grateful!

Shaun and Lucie, Daisy and Molly