RV 'Vent Lids' are what you want to look for
only the shower has a sky light, a big dome that doesn't open
those that open are 'Vents', take a good look at the hinge, take couple of pictures
check to see if all three are the same or different
vents all are a standard size that fit a 14" opening
but different mfg use different hinges
if the base is metal, just replace the vent lid
if the base is plastic, replace the whole thing
if the lid caps are brittle and cracking, so is the base
and you will end up with a water leak